Division

Expert replies

Previous Topic Next Topic

dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

by dtweah » Tue May 05, 2009 5:54 am

Which of the following is the quotient of (2^9 +3^9)/35

A. 521
B. 560
C. 577
D. 627
E. 842

Like this post

Source: Beat The GMAT — Problem Solving | Tue May 05, 2009 5:54 am

Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member; Thanked: 32 times

Re: Division

by Vemuri » Tue May 05, 2009 6:25 am

dtweah wrote:Which of the following is the quotient of (2^9 +3^9)/35

A. 521
B. 560
C. 577
D. 627
E. 842

Good one. I am sure there should be a easy way to solve this problem. I gave it just 2 mins & solved it manually to get C as the answer.

Like this post

dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

Re: Division

by dtweah » Tue May 05, 2009 7:51 am

Vemuri wrote:
dtweah wrote:Which of the following is the quotient of (2^9 +3^9)/35

A. 521
B. 560
C. 577
D. 627
E. 842
Good one. I am sure there should be a easy way to solve this problem. I gave it just 2 mins & solved it manually to get C as the answer.

You bet there is. Trying solving it that way. Mind you the numbers could be a little bigger on the GMAT. It can be solved in under one min.

Like this post

lilu: Master | Next Rank: 500 Posts; Posts: 148; Joined: Wed Dec 10, 2008 5:13 pm; Location: SF, CA; Thanked: 12 times

Re: Division

by lilu » Tue May 05, 2009 9:14 am

dtweah wrote:
Vemuri wrote:
dtweah wrote:Which of the following is the quotient of (2^9 +3^9)/35

A. 521
B. 560
C. 577
D. 627
E. 842
Good one. I am sure there should be a easy way to solve this problem. I gave it just 2 mins & solved it manually to get C as the answer.
You bet there is. Trying solving it that way. Mind you the numbers could be a little bigger on the GMAT. It can be solved in under one min.

Can you please let everyone one know about this method?
First, I thought we should use the fact that 2^9 is a small number when compared to 3^9 and ignore it, but answer choices are so close together that this method will definitely not work.

The more you look, the more you see.

Like this post

dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

Re: Division

by dtweah » Tue May 05, 2009 10:51 am

lilu wrote:
dtweah wrote:
Vemuri wrote:
dtweah wrote:Which of the following is the quotient of (2^9 +3^9)/35

A. 521
B. 560
C. 577
D. 627
E. 842
Good one. I am sure there should be a easy way to solve this problem. I gave it just 2 mins & solved it manually to get C as the answer.
You bet there is. Trying solving it that way. Mind you the numbers could be a little bigger on the GMAT. It can be solved in under one min.
Can you please let everyone one know about this method?
First, I thought we should use the fact that 2^9 is a small number when compared to 3^9 and ignore it, but answer choices are so close together that this method will definitely not work.

(2^3)^3 +(3^3)^3= (2^3 +3^3) ((2^3)^2 -(2^3) (3^3) +(3^3)^2)
RHS is 35 x 577
Sum of cubes. Watch out for sum and difference of cubes.

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