求问一道数学题

李大纹要坚强 · 发表于 2017-10-16 20:40:48

At a certain theater, the cost of each adult's ticket is $5 and the cost of each child's ticket is $2. What was the average (arithmetic mean) cost of all the adults' and children's tickets sold at the theater yesterday?

(1) Yesterday the ratio of the number of children's tickets sold at the theater to the number of adults' tickets sold at the theater was 3 to 2.

(2) Yesterday 80 adults' tickets were sold at the theater.

我觉得1+2可以求出来，但答案说是E。。。求高手相助

HGshine · 发表于 2017-10-16 21:51:35

貌似（1）就可以直接算了

KingYinQ · 发表于 2017-10-17 08:43:58

1.一共有3x+2x人，票的总价格是3x*2+2x*5，除以总人数可以算出平均数
2.不知道儿童票多少算不出来
只有1条件满足

求问一道数学题

所属分类: GMAT考试

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