蓝书上168页232题

chongov · 发表于 2010-8-19 22:49:29

232. A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half-gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture?
正确答案：(B)2.5
我的答案：(E)4
题目既然说最小单位是0.5加仑，那么按照5:3的比例配置灰色油漆，就至少需要5+3=8个最小单位，亦即4加仑
但为何正确答案是2.5加仑？

哈哈柚 · 发表于 2010-8-19 22:52:10

呵呵，可是题目中写了只需要2加仑呀，那么白色的要买3/4加仑，least 1加仑，黑色的5/4加仑 least 1.5加仑

chongov · 发表于 2010-8-19 23:12:33

理解了，谢谢

蓝书上168页232题

所属分类: GMAT考试

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