Gwd6-9:

For a certain play performance, adults’ tickets were sold for $12 each and children’s tickets were sold for $8 each. How many children’s tickets were sold for the performance?

(1)   The total revenue from the sale of adults’ and children’s tickets for the performance was $5,040.

(2)   The number of adults’ tickets sold for the performance was 1/3 the total number of adults’ and children’s tickets sold for the performance.

The Key is C.

Gwd6-30

Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?

(1) She bought $4.40 worth of stamps.

(2) She bought an equal number of $0.15 stamps and $0.29 stamps.

The Key is A.

我觉得这两个题目挺像的，12题也可以通过第一个条件推出结论阿，难道还有别的解么？麻烦大家举一下例子哦。谢谢。

数字的问题。

照理说都只有一个方程式

Price1*Amount1+Price2*Amount2=Total revenue

但是第二题的数字很特殊。0.15和0.29构不成比列，和为0.44

第一题8*1.5=12 所以A1和A2有任意的比率。

和小时候的鸡兔共笼题一样。