请教大大们：GWD_10_M_Q30

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.

Thanks.

这个题目数字有点巧合，0。15＋0。29＝0.44别的组合都凑不出来4.40的价钱。所以1是单独可以的。