单选题The average of a, b, c, d, and e is 28. If the average of a, c, and e is 24, what is the average of b and d?A31B32C33D34E36
单选题
The average of a, b, c, d, and e is 28. If the average of a, c, and e is 24, what is the average of b and d?
A
31
B
32
C
33
D
34
E
36
参考解析
解析：
If the average of a, b, c, d, and e is 28, then (a + b + c + d + e)/5 = 28, or a + b + c + d + e=5×28= 140. If the average of a, c, and e is 24, then (a + c + e)/3 = 24. Or a + c + e= 3 × 24 = 72. Substituting 72 for a+c+e in a+b+c+d+e=140 gives b+d+72 = 140, b +d = 140－72 = 68, (b + D./2 = 68/2 = 34.
If the average of a, b, c, d, and e is 28, then (a + b + c + d + e)/5 = 28, or a + b + c + d + e=5×28= 140. If the average of a, c, and e is 24, then (a + c + e)/3 = 24. Or a + c + e= 3 × 24 = 72. Substituting 72 for a+c+e in a+b+c+d+e=140 gives b+d+72 = 140, b +d = 140－72 = 68, (b + D./2 = 68/2 = 34.
相关考题：
以下关于AVERAGE函数使用正确的有() A.AVERAGE(B2，B5，4)B.AVERAGE(B2，B5)C.AVERAGE(B2：B5，4)D.AVERAGE(B2：B5，C2：C5)
设A1单元格中的公式为=AVERAGE(C1：E5)，将C列删除后，A1单元格中的公式将调整为( )。A.=AVERAGE(C1：E5)B.=AVERAGE(C1：D5)C.=AVERAGE(D1：E5)D.出错
以下关于AVERAGE函数使用正确的有（）。A AVERAGE（B2，B5，4）B AVERAGE（B3，B5）C AVERAGE（a2∶a5，4）D AVERAGE（B2∶B5，a3∶a5）
在Excel2003中，以下关于AVERAGE函数使用正确的有（）A、AVERAGE（B2，B5，4）B、AVERAGE（B3，B5）C、AVERAGE（B2：B5，4）D、AVERAGE（B2：B5，A3：A5）
在EXCEL中，下列公式表示正确的是（）A、"=AVERAGE（C2：F2）"B、"=AVERAGE（C2F2）"C、"=AVERAGE（C2+F2）"D、"=AVERAGE（C2+D2+E2+F2）"
在Excel中，要计算C5到E5之间所有单元格中数据的平均值，正确的选项是（）。A、AVERAGE（C5：E5）B、=AVERAGE（C5：E5）C、AVERAGE（C5+E5）D、=AVERAGE（C5+E5）
若单元格A5内公式为“=AVERAGE（B$2：B$5）”，则复制到B200单元格后公式变为（）。A、=AVERAGE（B$2：B$5）B、=AVERAGE（C$2：C$5）C、=AVERAGE（B$197：B$200）D、=AVERAGE（C$197：C$200）
What call performance statistics are reported on the Cisco Wireless IP Phone 7921 user interface?（）A、minimum jitterB、maximum jitterC、upstream standard packet deviationD、average MOS valueE、average conceal rate
已知A1单元格中的公式为＝AVERAGE（Bl：F6），将B列删除之后，A1单元格中的公式将调整为（）。A、=AVERAGE（＃REF！）B、=AVERAGE（C1：F6）C、=AVERAGE（B1：E6）D、=AVERAGE（B1：F6）
单选题When the average of a list of course grades is multiplied by the number of courses, the result is n. What does n represent?AHalf the number of coursesBHalf the sum of course gradesCThe number of coursesDThe average of the course gradesEThe sum of the course grades
单选题The average of a, b, c, and d is p. If the average of a and c is q, what is the average of b and d in terms of p and q?A2p+qB2p – qC2q +pD2q-pE(2p+q)/3
单选题If the average of 8 and x is 10 and the average of 7 and y is 11, what is the average of x and y?A9.0B10.5C12.0D13.5E15.00
单选题If the average of x and y is 11/2 and the average of 1/x and 1/y is 11/24, then xy =______.A4B6C11D12E14
单选题The average (arithmetic mean) of c and d is 12, and the average of c, d, and e is 10. What is the value of e?A6B10C12D18E20
问答题An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was its average speed for the two journeys?
问答题At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds?
问答题At the eating contest the winner ate an average of 15 hot dogs at the first 20 sittings. After a further 20 sittings the average increased to 20 hot dogs. What was the average for the last 20 sittings?
单选题If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?A6.0B6.2C6.4D6.6E6.8
单选题若单元格A5内公式为“=AVERAGE（B$2：B$5）”，则复制到B200单元格后公式变为（）。A=AVERAGE（B$2：B$5）B=AVERAGE（C$2：C$5）C=AVERAGE（B$197：B$200）D=AVERAGE（C$197：C$200）
单选题已知A1单元格中的公式为＝AVERAGE（Bl：F6），将B列删除之后，A1单元格中的公式将调整为（）。A=AVERAGE（＃REF！）B=AVERAGE（C1：F6）C=AVERAGE（B1：E6）D=AVERAGE（B1：F6）
单选题设A1单元格中的公式为=AVERAGE（C1：E5），将C列删除后，A1单元格中的公式将调整为（）。A=AVERAGE（C1：E5）B=AVERAGE（C1：D5）C=AVERAGE（D1：E5）D出错
单选题已知Al单元格中的公式为=AVERAGE（B1：F6），将B列删除之后，A1单元格中的公式将调整为（）。A=AVERAGE（#REF!）B=AVERAGE（C1：F6）C=AVERAGE（B1：E6）D=AVERAGE（B1：F6）
单选题The average (arithmetic mean) of a set of seven numbers is 81. If one of the numbers is discarded, the average of the remaining numbers is 78. What is the value of the number that was discarded?A98B99C100D101E102
单选题If the average (arithmetic mean) of a, b, 4, and 10 is 8, what is the value of a + b?A4B6C9D15E18
问答题What is the average (arithmetic mean) of x and y? (1) The average of x+3 and y+5 is 14. (2) The average of x,y and 16 is 12.