Page 1 of 1 [ 3 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Ratio Practice Test QuestionPosted: Tue Nov 29, 2011 7:17 pm

Joined: Sun Nov 13, 2011 6:58 am
Posts: 3
I am having difficulty figuring out how the answer to this question is 40 per the solution on the gmat practice test. I set up the ratio 5x:3x... I then set up the equation of 7/5= x/10+x to come up with X, but that is where I am stuped..Help please!!

Here is the question:

The number of stamps that kaye & Alberto had were in the ratio of 5:3 respectively. After Kaye gave Alberto 10 of her stamps the ratio Kaye had to the number Alberto had was 7:5. As a result of the gift, Kaye had how many more stamps than Alberto?

The choices were : A-20, B-30, C-40, D-60, E-90

Top

 Post subject: Re: Ratio Practice Test QuestionPosted: Tue Nov 29, 2011 7:32 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
K/A = 5/3
3K = 5A
3K - 5A = 0
15K - 25A = 0

(K - 10)/(A + 10) = 7/5
5K - 50 = 7A + 70
5K - 7A = 120
15K - 21A = 360

15K - 25A = 0
15K - 21A = 360

- 4A = - 360

A = 90

15K - 25(90) = 0

15K = 25*90

K = 25*90/15 = 150

K - 10 = 140

A + 10 = 90

140 - 90 = 50

Veritas Help

Top

 Post subject: Re: Ratio Practice Test QuestionPosted: Fri Jul 27, 2012 9:53 am

Joined: Mon Jul 09, 2012 9:29 am
Posts: 2
the answer is D, because A = 90 (as stated above by VeritasHelp), and K = (A*5)/3 which means K = 150.

The question asks "how many MORE", so final answer would be 150 - 90 = 60. D.

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 3 posts ]

 All times are UTC - 8 hours [ DST ]

#### Who is online

Users browsing this forum: No registered users and 1 guest

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

 Search for: