题目信息
There are X girls in a class, and their average height is M inches. In the same class, there are Y boys with an average height of N inches. What is the average height of all the students in the class?
A:$${X+Y}\over{M+N}$$
B:$${M+N}\over{X+Y}$$
C:$${XM+YN}\over{M+N}$$
D:$${XM+YN}\over{X+Y}$$
E:$$\frac{MN}{XY}$$
参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等; 如有疑问,欢迎在评论区提问与讨论
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已选答案:
正确答案:
D:$${XM+YN}\over{X+Y}$$
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题目来源
Manhattan