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## IR Question - how to solve

This topic has 1 expert reply and 0 member replies
prashanth.guru Newbie | Next Rank: 10 Posts
Joined
21 Jul 2013
Posted:
6 messages

#### IR Question - how to solve

Thu Aug 08, 2013 11:40 pm

Please let me how to solve the question in the attached image to arrive at the ans marked in the squares of each column

### GMAT/MBA Expert

Mike@Magoosh GMAT Instructor
Joined
28 Dec 2011
Posted:
768 messages
Followed by:
137 members
387
Mon Aug 26, 2013 2:03 pm
Dear prashanth.guru,
I'm happy to help with this.

We know that r = 5, so this gives us the equation

5 = (4x + 8y)/(x + y)

Multiply both sides by that denominator, (x + y)

5*(x + y) = 4x + 8y
5x + 5y = 4x + 8y
x = 3y

So, we see that x must be three times y. So, start with the smallest y: if y = 21, then x = 3*21 = 63, which is not an option. Next y, y = 32, means x = 3*32 = 96 --- bingo! That's it. OA = {x = 96, y = 32}

Does this make sense?

BTW, you may find this helpful:
http://magoosh.com/gmat/2012/gmat-integrated-reasoning-ebook/

Mike

_________________
Magoosh GMAT Instructor
https://gmat.magoosh.com/

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