A35372. $The average age of the 40 members of a computer science camp is 17 years.There are 20 girls,15 boys, and 5 adults. If the average age of the girls is 15 and the average age of the boys is 16, what is\dots$

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平均数计算加权平均

题目描述

The average age of the 40 members of a computer science camp is 17 years.There are 20 girls,15 boys, and 5 adults. If the average age of the girls is 15 and the average age of the boys is 16, what is the average age of the adults?( )。

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