OG11 Quant Diagnostic question 22

Expert replies

neekoh: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Sat May 31, 2008 11:37 pm

by neekoh » Sat May 31, 2008 11:44 pm

The answer for question 22 in the OG11 quantitative diagnostic on page 54/55 simplifies

2(2sqrt2/sqrt n) = 4(sqrt2/sqrt n) = 4(2/sqrt n)

how did sqrt 2 become 2? what am i missing here, or is this a mistake in the book?

Like this post

Source: Beat The GMAT — Problem Solving | Sat May 31, 2008 11:44 pm

raunekk: Legendary Member; Posts: 1159; Joined: Wed Apr 16, 2008 10:35 pm; Thanked: 56 times

by raunekk » Sun Jun 01, 2008 2:40 am

clyinder is half full.(H is height),therefore H/2 is full.

Volume =pai* r^2*H=36
= pai*r^2*(9/2)=36
therefore, r=(8/pai)^1/2

now,dia of base= 2*r=2*((2^2 *2)/pai)^1/2 (8=2^2 * 2)
= 2*2(2/pai)^1/2
=4(2/pai)^1/2

I hope tis will suffice..

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 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