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Brad
 Post subject: GMAT Prep Problem #1
PostPosted: Wed Nov 16, 2011 10:04 am 
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Joined: Wed Nov 16, 2011 9:56 am
Posts: 1
What is this = to?
(2^5)+(2^5)+(3^5)+(3^5)+(3^5)

I selected 13^5
Correct answer 2^6 +3^6

Please explain.

Also,
Please explain problem Problem# 3 page 8 in Algebra Book.

thanks,
Brad
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VP_Help
 Post subject: Re: GMAT Prep Problem #1
PostPosted: Wed Nov 16, 2011 5:35 pm 
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Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
(2^5)+(2^5)+(3^5)+(3^5)+(3^5)

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


2 * 2*2*2*2*2 + 3 * 3*3*3*3*3

2^6 + 3^6



#3

2^(4x) + 2^(4x) + 2^(4x) + 2^(4x) = 4^24

4 * 2^(4x) = (2^2)^24

4 * 2^(4x) = 2^48


4 * 2^(4x) = 2^2 * 2^46


4 * 2^(4x) = 4 * 2^46


2^(4x) = 2^46

4x = 46

x = 11.5
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