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GMAT Prep practice test 2 - PS q 36

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Andersoeh: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Sun Sep 19, 2010 6:15 am

GMAT Prep practice test 2 - PS q 36

by Andersoeh » Mon Jun 15, 2015 2:25 am

Can any of you help with solving this:

((1/5)^m)*((1/4)^18)) = 1/(2*(10^35)), then m is?

Thanks a lot in advance!

Best A

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Source: Beat The GMAT — Problem Solving | Mon Jun 15, 2015 2:25 am

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by GMATGuruNY » Mon Jun 15, 2015 2:32 am

When you post a problem, please include the answer choices.

If (1/5)^m * (1/4)^18 = 1/[2(10)Â³â�µ], then m = ?

A. 17

B. 18

C. 34

D. 35

E. 36

On the right side, we have 1/10Â³â�µ = 1/2Â³â�µ * 1/5Â³â�µ.
Thus, the left side must also include 1/5Â³â�µ, implying that m=35.

The correct answer is D.

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