Target Test Prep's 2024 GMAT Focus Edition prep is discounted for the BTG community!

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

milk

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 345
Joined: Wed Mar 18, 2009 6:53 pm
Location: Sao Paulo-Brazil
Thanked: 12 times
GMAT Score:660

milk

by shibal » Tue Jun 30, 2009 5:00 pm
Three grades of milk: 1%, 2%, and 3% fat by volume. X gallons of 1%, y gallons of 2%, and z gallons of 3% are mixed to give x + y + z gallons of 1.5%. What is x in terms of y and z?

oa: y+3z
Top
Master | Next Rank: 500 Posts
Posts: 392
Joined: Thu Jan 15, 2009 12:52 pm
Location: New Jersey
Thanked: 76 times

by truplayer256 » Tue Jun 30, 2009 5:10 pm
This question has been asked many times by Beat the GMAT users. Please search the question before posting it.

https://www.beatthegmat.com/ratios-grade ... tml#156772
Top
Master | Next Rank: 500 Posts
Posts: 345
Joined: Wed Mar 18, 2009 6:53 pm
Location: Sao Paulo-Brazil
Thanked: 12 times
GMAT Score:660

by shibal » Tue Jun 30, 2009 6:11 pm
i try to solve x/100 + 2y/100 + 3z/100 = 3(x+y+z)/200 for x and i don't get y+3z... can someone pls help me?
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 472
Joined: Sun Mar 29, 2009 6:54 pm
Thanked: 56 times

by ssmiles08 » Tue Jun 30, 2009 6:49 pm
shibal wrote:i try to solve x/100 + 2y/100 + 3z/100 = 3(x+y+z)/200 for x and i don't get y+3z... can someone pls help me?
you are on the right track:

x/100 + 2y/100 + 3z/100 = 3x/200 + 3y/200 + 3z/200.

(2y/100 - 3y/200) + (3z/100 - 3z/200) = 3x/200 - x/100.

(4y-3y)/200 + (6z - 3z)/200 = (3x - 2x)/200

y/200 + 3z/200 = x/200

Multiply both sides by 200.

y + 3z = x

-hope this helps.
Top
Post new topic Post Reply
• Page 1 of 1