test 38 #16

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Mon Apr 30, 2007 11:41 pm

Hi,

I think I've seen this problem but can't remember the solution. Can anyone help?

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Source: Beat The GMAT — Problem Solving | Mon Apr 30, 2007 11:41 pm

Cybermusings: Legendary Member; Posts: 559; Joined: Tue Mar 27, 2007 1:29 amFollowed by: 2 members; Thanked: 5 times

by Cybermusings » Tue May 01, 2007 9:05 am

formula here is{ [40x/100 + 25y/100] / x+y }*100 = 30

10x = 5y
or x/y = 5/10 = 1/2
= 50%

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Tue May 01, 2007 3:07 pm

Thank you for your response ....but the answer seems to be B).

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jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member; Location: Silicon valley, California; Thanked: 30 times

by jayhawk2001 » Tue May 01, 2007 9:09 pm

From the question, we know that the resulting mixture contains
30% Ryegrass. So,

.4X + .25Y = .3 (X+Y)
.1x = .05Y
Y = 2X

We are asked to find X / (X+Y) = X / 3X = 1/3

This is 33 1/3%

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