[求助]prep1ps-69

llxx1985cn

69.   8112-!-item-!-187;#058&005781

The number of stamps that Kaye and Alberto had were in the ratio 5 : 3, respectively.  After Kaye gave Alberto 10 of her stamps, the ratio of the number Kaye had to the number Alberto had was 7 : 5.  As a result of this gift, Kaye had how many more stamps than Alberto?

 

(A) 20

(B) 30

(C) 40

(D) 60

(E) 90

答案是C,我怎们觉得应该是D呢？

fly_holly

As a result of this gift...

题目中有这个条件，说明要求的是赠送以后的相差数，陷阱啊。

luoclarence

沦陷在陷阱里