题目信息
In a certain class, x students are 10 years old, and the remaining y students are 11 years old. What is the average (arithmetic mean) age of all students in the class?
A:$${x+y}\over{21}$$
B:$${10x+11y}\over{21}$$
C:$${110xy}\over{x+y}$$
D:$${110xy}\over{xy}$$
E:$${10x+11y}\over{x+y}$$
参考答案及共享解析

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已选答案:
正确答案:
E:$${10x+11y}\over{x+y}$$
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题目来源
Magoosh