单选题In a class of 160 seniors, the ratio of boys to girls is 3 to 5. In the junior class, the ratio of boys to girls is 3 to 2. When the two classes are combined, the ratio of boys to girls is 1 to 1. How many students are in the junior class?A400B360C200D180E160
单选题
In a class of 160 seniors, the ratio of boys to girls is 3 to 5. In the junior class, the ratio of boys to girls is 3 to 2. When the two classes are combined, the ratio of boys to girls is 1 to 1. How many students are in the junior class?
A
400
B
360
C
200
D
180
E
160
参考解析
解析：
因为这个班共有160人，男生和女生的比例为3:5，所以男生和女生的人数分别为(3/8) ×160 = 60人，(5/8) ×160 = 100人。假设另一班男生女生人数共有x人，那么男生女生的人数分别为(3/5)x，(2/5)x，又因为当两班的人数相加后，男生女生的比例相等，所以可得出60 + (3/5)x = 100 + (2/5)x，经计算，x = 200。
因为这个班共有160人，男生和女生的比例为3:5，所以男生和女生的人数分别为(3/8) ×160 = 60人，(5/8) ×160 = 100人。假设另一班男生女生人数共有x人，那么男生女生的人数分别为(3/5)x，(2/5)x，又因为当两班的人数相加后，男生女生的比例相等，所以可得出60 + (3/5)x = 100 + (2/5)x，经计算，x = 200。
相关考题：
Bob is __ of the two boys. Mary is ____ of the three girls. A、tall,shortB、taller,the shorterC、tallest,the shortestD、the taller,the shortest
BPeople usually think that boys are stronger，heavier and taller than girls． Maybe it's true．Some people even think that boys are smarter than girls．Expert's view:l can' t agree with them． If you say that girls learn faster than boys，you may be right，at least when it comes to young chimps(猩猩) using tools．People found that girl chimps in Tanzania，East Africa，use sticks to find tasty insects(昆虫) two years earlier than boy chimps． This is because young girl chimps watch their moms col-lect bugs，while the boy chimps climb trees．But young boy chimps may hunt and throw(扔) sooner than girl clumps．It's also true for humans．It-s easier for girls to learn to write and draw earlier，but boys often run and throw balls earlier than girls．Teacher's view:l think boys and girls both have their special advantages． Boys are good at sports． They are very athletic． But girls do well in performance． They are very calm．( )26． People usually think boys are _________'than girls．A． tallerB． strongerC． heavierD． All of the above
28． Teachers think that__________A． boys and girls both have their special advantagesB． boys are calmer than girlsC． girls are better at sports than boysD． girls do better in drawing than boys
30． What-s the best title of the passage?A． Boys and Girls． ．B． Are’Girls Smarter?C． Young Boy and Girl Chimps．D． Are Boys Slower?
According to the author, the reason why parental divorce has greater effect on boys than on girls is that_____.［A］ all cultures encourage male aggression and noncompliance［B］ boys are always involved in their parents’ fights［C］ males are usually viewed as the models in self-control and strong will［D］ boys are basically more self-disciplined than girls
The text indicates that private schools are very selective because they[A] have no reliable methods to pick students for a class.[B] want a good mixture of boys and girls for classes.[C] encounter more demand than they can cope with.[D] prefer to enroll children of their relatives.
In terms of receiving acceptance from teachers the proportion of boys to girls is appropriately equal. (Sexism in Class) () 此题为判断题(对，错)。
－ How many students do you teach? － _________ A、Quite a bit.B、More boys than girls.C、About 50.D、Three mornings.
25． Which sentence is right according to the passage?A． There are no green sweaters．B． Young boys and girls like T-shirts very much．C， The T-shirt in Hualin are for young boys．and girls．D． Only the things in the advertisement are cheap．
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共用题干第三篇Boys' schools are the perfect place to teach young men to express their emotions and are more likely to get involved in activities such as art,dance and music,according to research released today.Far from the traditional image of a culture of aggressive masculinity,the absence of girls gives boys the chance to develop without pressure to conform to a stereotype,the U.S. study says.Boys at single-sex schools were said to be more likely to get involved in cultural and artistic activities that helped develop their emotional expressiveness,rather than feeling they had to conform to the "boy code" of hiding their emotions to be a "real man".The report,presented at a conference of the International Boys' Schools Coalition in London attended by the heads of private and state schools,goes against received wisdom that boys do better when taught alongside girls.The headmaster of Eton,Tony Little,warned that boys were being failed by the British education system because it had become too focused on girls.He criticised teachers for failing to recognise that boys are actually more emotional than girls,despite the fact that girls"turn on the waterworks".The research argued that boys often perform badly in mixed schools because they become demoralised when their female counterparts do better earlier in verbal skills and reading,because the left side of the brain develops faster in girls.They also felt they had to be"cool"rather than studious. But in single-sex schools teachers are able to tailor lessons to boys' learning style,letting them move around the classroom and getting them to compete in teams to prevent boredom,wrote the study's author,education expert Abigail James,of the University of Virginia.Teachers could encourage boys to enjoy reading and writing with specifically"boy-focused" approaches such as themes and characters that appeal to them. Because,the researchers say,boys generally have better spatial skills,more acute vision,learn best through touch,are more impulsive and more physically active,they need to be given "hands-on" lessons where they are allowed to walk around." Boys in mixed schools view classical music as feminine and prefer the modern genre in which violence and sexism are major themes,"James wrote.Single-sex education also made it less likely that boys would feel they had to conform to a stereotype gained from the media by girls that men should be "masterful and in charge" in relationships. "in the present sexualised atmosphere prevalent in mnixed schools,boys feel coerced into acting like men before they understand themselves well enough to know what that means,"the report said.It is commonly believed that in a mixed school boys__________.A:perform relatively betterB:grow up more healthilyC:behave more responsiblyD:receive a better education
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共用题干Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary school,the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship between what female teachers think and what female students learn:If a female teacher is uncomfortable with her own math skills,then her female students are more likely to believe that boys are better than girls at math.If these girls keep getting math-anxious female teachers in later grades,it may create a snowball effect on their math achievement said Levine. In other words,girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up believing that boys are better at math than girls are,then these girls may not do as well as they would have if they were more confident.Just as students find certain subjects to be difficult,teachers can find certain subjects to be difficult to learn一and teach. The subject of math can be particularly difficult for everyone. Researchers use the word“anxiety”to describe such feelings:anxiety is uneasiness or worry.The new study found that when a teacher has anxiety about math,that feeling can influence how her female students feel about math. The study involved 65 girls,52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year,and the researchers compared the scores.The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers:To find out which teachers were anxious about math,the researchers asked the teachers how they felt at times when they came across math,such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt,for example,was probably anxious about math.Boys,on average,were unaffected by a teacher's anxiety. On average,girls with math-anxious teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus,on the test showing whether someone thought a math superstar had to be a boy,20 girls showed feeling that boys would be better at math一and all of these girls had been taught by female teachers who had math anxiety.“This is an interesting study,but the results need to be interpreted as preliminary and in need of replication with a larger sample,”said David Geary,a psychologist at the University of Missouri in Columbia.What is the result of the research at the University of Chicago,according to the first paragraph?A:Girls comfortable with their own math skills are better than boys at math.B: Girls uncomfortable with their own math skills are not as good as boys at math.C: Female teachers'math skills have influence over girl students'math skills.D: Female teachers'confidence in their math skills is related to girls'math skills.
共用题干Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary school,the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship between what female teachers think and what female students learn:If a female teacher is uncomfortable with her own math skills,then her female students are more likely to believe that boys are better than girls at math.If these girls keep getting math-anxious female teachers in later grades,it may create a snowball effect on their math achievement said Levine. In other words,girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up believing that boys are better at math than girls are,then these girls may not do as well as they would have if they were more confident.Just as students find certain subjects to be difficult,teachers can find certain subjects to be difficult to learn一and teach. The subject of math can be particularly difficult for everyone. Researchers use the word“anxiety”to describe such feelings:anxiety is uneasiness or worry.The new study found that when a teacher has anxiety about math,that feeling can influence how her female students feel about math. The study involved 65 girls,52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year,and the researchers compared the scores.The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers:To find out which teachers were anxious about math,the researchers asked the teachers how they felt at times when they came across math,such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt,for example,was probably anxious about math.Boys,on average,were unaffected by a teacher's anxiety. On average,girls with math-anxious teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus,on the test showing whether someone thought a math superstar had to be a boy,20 girls showed feeling that boys would be better at math一and all of these girls had been taught by female teachers who had math anxiety.“This is an interesting study,but the results need to be interpreted as preliminary and in need of replication with a larger sample,”said David Geary,a psychologist at the University of Missouri in Columbia.The sixth paragraph tells us that the research findings______.A:prove a strong link between female teachers'math anxiety and their female students' math achievementsB: show that male students are less likely to be affected by their math anxiety than female studentsC: provide strong evidence that math superstars are more likely to be males than femalesD: discover a strong link between teachers'math anxiety and their students'math achievements
共用题干Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary school,the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship between what female teachers think and what female students learn:If a female teacher is uncomfortable with her own math skills,then her female students are more likely to believe that boys are better than girls at math.If these girls keep getting math-anxious female teachers in later grades,it may create a snowball effect on their math achievement said Levine. In other words,girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up believing that boys are better at math than girls are,then these girls may not do as well as they would have if they were more confident.Just as students find certain subjects to be difficult,teachers can find certain subjects to be difficult to learn一and teach. The subject of math can be particularly difficult for everyone. Researchers use the word“anxiety”to describe such feelings:anxiety is uneasiness or worry.The new study found that when a teacher has anxiety about math,that feeling can influence how her female students feel about math. The study involved 65 girls,52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year,and the researchers compared the scores.The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers:To find out which teachers were anxious about math,the researchers asked the teachers how they felt at times when they came across math,such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt,for example,was probably anxious about math.Boys,on average,were unaffected by a teacher's anxiety. On average,girls with math-anxious teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus,on the test showing whether someone thought a math superstar had to be a boy,20 girls showed feeling that boys would be better at math一and all of these girls had been taught by female teachers who had math anxiety.“This is an interesting study,but the results need to be interpreted as preliminary and in need of replication with a larger sample,”said David Geary,a psychologist at the University of Missouri in Columbia.According to the experiment,those teachers were probably anxious about math when they felt______.A:nervous memorizing the numbers of a sales receiptB: helpless saving the numbers of a sales receiptC: uneasy reading the numbers of a sales receiptD: hopeless filling in the numbers of a sales report
共用题干Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary school,the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship between what female teachers think and what female students learn:If a female teacher is uncomfortable with her own math skills,then her female students are more likely to believe that boys are better than girls at math.If these girls keep getting math-anxious female teachers in later grades,it may create a snowball effect on their math achievement said Levine. In other words,girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up believing that boys are better at math than girls are,then these girls may not do as well as they would have if they were more confident.Just as students find certain subjects to be difficult,teachers can find certain subjects to be difficult to learn一and teach. The subject of math can be particularly difficult for everyone. Researchers use the word“anxiety”to describe such feelings:anxiety is uneasiness or worry.The new study found that when a teacher has anxiety about math,that feeling can influence how her female students feel about math. The study involved 65 girls,52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year,and the researchers compared the scores.The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers:To find out which teachers were anxious about math,the researchers asked the teachers how they felt at times when they came across math,such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt,for example,was probably anxious about math.Boys,on average,were unaffected by a teacher's anxiety. On average,girls with math-anxious teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus,on the test showing whether someone thought a math superstar had to be a boy,20 girls showed feeling that boys would be better at math一and all of these girls had been taught by female teachers who had math anxiety.“This is an interesting study,but the results need to be interpreted as preliminary and in need of replication with a larger sample,”said David Geary,a psychologist at the University of Missouri in Columbia.What is implied in the third paragraph?A: Math teachers,like math learners,do not like the subject due to its difficulty.B: A difficult subject like math may affect teachers'confidence in teaching the subject.C: Teachers are more anxious teaching math than their students learning math.D: Math is so difficult that no teachers like to teach it.
共用题干Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary school,the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship be-tween what female teachers think and what female students learn:If a female teacher is un-comfortable with her own math skills,then her female students are more likely to believe that boys are better than girls at math.If these girls keep getting math-anxious female teachers in later grades,it may create a snowball effect on their math achievement said Levine. In other words,girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up be-lieving that boys are better at math than girls are,then these girls may not do as well as they would have if they were more confident.Just as students find certain subjects to be difficult,teachers can find certain subjects to be difficult to learn一and teach. The subject of math can be particularly difficult for every-one. Researchers use the word“anxiety”to describe such feelings:anxiety is uneasiness or worry.The new study found that when a teacher has anxiety about math,that feeling can influ-ence how her female students feel about math. The study involved 65 girls,52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year,and the researchers com-pared the scores.The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers:To find outwhich teachers were anxious about math,the researchers asked the teachers how they felt at times when they came across math,such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt,for example, was probably anxious about math.Boys,on average,were unaffected by a teacher's anxiety. On average,girls with math-anxious teachers scored lower on the end-of-the-year math tests than other girls in the studydid. Plus,on the test showing whether someone thought a math superstar had to be a boy,20 girls showed feeling that boys would be better at math一and all of these girls had been taught by female teachers who had math anxiety.“This is an interesting study,but the results need to be interpreted as preliminary and in need of replication with a larger sample,”said David Geary,a psychologist at the University of Missouri in Columbia.What is the result of the research at the University of Chicago,according to the firstparagraph?A: Girls comfortable with their own math skills are better than boys at math.B: Girls uncomfortable with their own math skills are not as good as boys at math.C: Female teachers'math skills have influence over girl students'math skills.D: Female teachers'confidence in their math skills is related to girls'math skills.
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