400-600-1123
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答案：
A
Adult:5
Child:2
Average cost yesterday?
(1)c/a=3/2 总费用：3/2a*2+5a; 总人数：a+3/2a ;平均数：相除：16/5,充分
(2)80a 卖了，a一共卖了：400刀；但是c的呢？不充分
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