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 8 and x is 10 and the average of 7 and y is 11, what is the average of x and y?
A

9.0

B

10.5

C

12.0

D

13.5

E

15.00


参考解析

解析:
因为8和x的平均数为10,可得出(8+x)/2=10,x=12。又因为7和y的平均数为11,所以可得出7 + y = 22,y=15,所以x和y的平均值为(x+y)/2=(12+15)/2= 27/2=13.5。

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