单选题Raphine received grades of 75, 90, 87, and 79 on four math exams. What is the lowest score he can receive on his next math exam and have aft average of at least 82 on the five exams?A90B82C79D78E80
单选题
Raphine received grades of 75, 90, 87, and 79 on four math exams. What is the lowest score he can receive on his next math exam and have aft average of at least 82 on the five exams?
A
90
B
82
C
79
D
78
E
80
参考解析
解析:
Let x represent the lowest Score Ralphie can receive on his next math exam. (75 + 90 + 87 + 79 + x)/5=82, x=410-331=79.
Let x represent the lowest Score Ralphie can receive on his next math exam. (75 + 90 + 87 + 79 + x)/5=82, x=410-331=79.
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