GWD数学

lingluogx

请大家帮忙看看这道题应该选什么？

Q13:

Juan bought some paperback books that cost $8 each and some hardcover books that cost $25 each.  If Juan bought more than 10 paperback books, how many hardcover books did he buy?

(1)     The total cost of the hardcover books that Juan bought was at least $150.

(2)     The total cost of all the books that Juan bought was less than $260.

ann4u

我认为这道题选C
首先1.2单独都不能判断应该很明显吧~
然后，paperback books>=88已知(more than 10)
1）hardcover books>=150
2）all books <260

因为all books<260 paperback books>80
因此150=<hardcover books<172

因此hardcover books=150 因此为6本

lingluogx

万分感谢！