求227.一道应该简单但就算不出来 >_<"'

landsend · 发表于 2013-10-29 11:33:13

227. DS

Sell 5 sweaters and 4 jackets. For sweaters, profit is 50%of the revenue. For jackets, profit is 40% of the revenue. What is the revenueof 5 sweaters?

1) total revenues is some number.

2) total profit is some number.

条件一不充分，明显得不出毛衣的收入；条件二同样的不出来；条件一和二合起来可以联立方程，可以求出来充分C

即使有具体数字，　为啥一和二可得出revenue of 5 sweaters??

frank894848955 · 发表于 2013-10-29 11:40:52

设sweater的revenue为x，jacket的revenue为y。
0.5x+0.4y=total profit
x+y=total revenue
revenue和profit都是已知

landsend · 发表于 2013-10-29 11:44:33

frank894848955 发表于 2013-10-29 11:40
设sweater的revenue为x，jacket的revenue为y。
0.5x+0.4y=total profit
x+y=total revenue

好感谢！！！我想太多，撤到cost, price .......

求227.一道应该简单但就算不出来 >_<"'

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块