问个题

7-11

A shipment of banners contains banners of two different shapes, triangular and square, and two different colors, red and green. In a particular shipment 26% of the banners are square and 35% of the banners are red. If 60% of the red banners in the shipment are square, what is the ratio of red triangular banners to green triangular banners?
(A) 7/50
(B) 3/13
(C) 7/30
(D) 13/37
(E) 35/26

Answer: C
麻烦高手们解答一下。

嘿嘿猫

7-11 发表于 2013-8-8 21:45
感谢你的及时解答

我觉得这种类型的题画表最方便哎~~~横列是red，green；纵列是三角，方形~~

7-11

conanxuan 发表于 2013-8-8 21:20
红三角有35%X40%=14%
三角有100%-26%=74%
红三角：绿三角=14%：（74%-14%）=7：30

感谢你的及时解答

conanxuan

红三角有35%X40%=14%
三角有100%-26%=74%
红三角：绿三角=14%：（74%-14%）=7：30