Ratio??

Expert replies

tekno9000: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Sat Jul 28, 2007 3:35 pm

by tekno9000 » Thu May 22, 2008 4:49 pm

Please solve and explain.

A square counter top has a square tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39,which of the following could be the width, in inches, of the strip?
I. 1
II. 3
III. 4

A I only
B II only
C I & II only
D I & III only
E. I,II & III

Thanks,

Tekno9000

Like this post

Source: Beat The GMAT — Problem Solving | Thu May 22, 2008 4:49 pm

aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Fri May 23, 2008 6:36 am

I will go with E

Suppose the side of tiled area is x and side of total area is y

Q says x^2/(y^2-x^2) = 25/39

Solve this to get x/y = 5/8. Means if x = 5, y = 8 so width of untiled strip is 8-5 = 3

From the ans we can form equations y-x=1, y-x=3 and y-x=4

All 3 equations combined with x/y=5/8 is solvable for x and y

OA?

Like this post

jscoligan: Junior | Next Rank: 30 Posts; Posts: 12; Joined: Mon Jan 21, 2008 11:12 pm

by jscoligan » Fri May 23, 2008 10:12 am

I agree, I don't see why it can't be all three answers....

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review