建议使用官方纸质指南,查看对照完整题目
【OG20-P181-227题】
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75.percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of the mixture is X ?
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



0.4x+0.25y=0.3*(x+y)
y=2x
x/(x+y)=x/3x=1/3
题目讨论 (10条评论)

-
Crystal8
好多信息都是干扰,最开始我还计算XY里面组成占比,根本算不了,才发线其实只要设X就好,设x占比a,那么y占比1-a ,然后列式子
0
1 回复 2021-11-23 13:23:12
-
贾思敏
我觉得这道题,直接设x+y的总量是100,会比较好算一点,比较直观地求出x的占比(60 percent bluegrass和75.percent fescue是无用信息)
1
0 回复 2021-10-05 18:57:29
-
如果有时间的话我也能做对
我只能根据题意把范围缩小到33和40上,靠感觉33可能性更大。完成
0
0 回复 2021-07-11 01:00:39
-
少冰冷萃
我是想着除了ryegrass就是bluegrass,结果就列出了一个二元一次方程组, 解一下也能得到,不知道这样想有没有毛病。
0
0 回复 2021-04-29 16:35:22
-
你这只猪
做题的时候一直在发挥想象,拜托你就按题列公式即可,自己的想法太多,不好
1
0 回复 2020-07-07 16:08:34
-
jack0801
推薦gmatclub的rohityes大大解法: https://gmatclub.com/forum/seed-mixture-x-is-40-percent-ryegrass-and-60-percent-bluegrass-by-weig-60580.html Let M = x + y M = New mixture x = Mixture X y = Mixture Y What do we need to find ?? => (x/M)*100 Equating Ryegrass in the mixture - .4x + 0.25y = 0.3M .4x + 0.25(M-x) = 0.3M .4x + 0.25M - 0.25x = 0.3M .15x = .05M x/M = 1/3 Hence ans = 33.33%.
2
0 回复 2020-06-07 00:45:19
-
emily666
(0.4X+0.25y)/(x+y) =0.3,y=2x,代入x/x+y=1/3
1
0 回复 2020-03-13 20:11:34
-
赤木青帝
要审题
0
0 回复 2019-12-09 21:45:18
-
默默
先根据已知条件列一个等式,然后求解
0
0 回复 2018-05-10 05:19:11
-
( ¨̮ )
是2y=x吧
0
0 回复 2018-04-04 18:57:05
-
( ¨̮ )回复( ¨̮ )
不对不对说错了
0
0 回复 2018-04-04 18:57:46
-
棒棒哒胖胖回复( ¨̮ )
我已经求出来等量关系了,确弄了50%出来,服了我这个吃货了
0
0 回复 2018-10-23 20:37:20
-
棒棒哒胖胖回复( ¨̮ )
y=2x
0
0 回复 2018-10-23 20:39:24
-