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# GMATprep Practice Test Question- Help

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Current Student
Joined: 06 Sep 2005
Posts: 49
GMATprep Practice Test Question- Help [#permalink]

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24 Apr 2006, 11:51
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

There was a question as follows:

Which of the following is closest to:

2^5 + 2^5 + 3^5 + 3^5 + 3^5

The answer is 2^7 + 3^8.

Is there a faster way to do these type of problems (rather than do the actual calculation)?

Thanks
Manager
Joined: 20 Nov 2004
Posts: 108

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24 Apr 2006, 12:28
What were the other answer choices? The question and the solution
you give are so much apart (793 vs. 6689) that it depends on the
other choices whether there is a quicker way.
Manager
Joined: 20 Mar 2005
Posts: 201
Location: Colombia, South America
Re: GMATprep Practice Test Question- Help [#permalink]

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24 Apr 2006, 12:44
CfaMiami wrote:
There was a question as follows:

Which of the following is closest to:

2^5 + 2^5 + 3^5 + 3^5 + 3^5

The answer is 2^7 + 3^8.

Is there a faster way to do these type of problems (rather than do the actual calculation)?

Thanks

What about factorization?

2*(2^5) + 3*(3^5)

= 2^6 + 3^6

but yeah we would need to check the other options
Current Student
Joined: 06 Sep 2005
Posts: 49

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25 Apr 2006, 05:45
Sorry, the other choices are

5^6

13^5

2^6 + 3^6

4^5 + 9^5

it's on practice test one of the gmatprep software
25 Apr 2006, 05:45
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# GMATprep Practice Test Question- Help

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