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GMATPrep: DS problem

This topic has 1 expert reply and 1 member reply
kookoo4tofu Junior | Next Rank: 30 Posts Default Avatar
Joined
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Posted:
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GMATPrep: DS problem

Post Mon May 07, 2007 12:18 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Not sure how to do this one. please help! thanks.

    If x and y are positive integers, what is the value of x + y?
    (1) (2^x)(3^y) = 72
    (2) (2^x)(2^y) = 32

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    jayhawk2001 Community Manager
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    Post Mon May 07, 2007 8:58 pm
    kookoo4tofu wrote:
    Not sure how to do this one. please help! thanks.

    If x and y are positive integers, what is the value of x + y?
    (1) (2^x)(3^y) = 72
    (2) (2^x)(2^y) = 32
    Is it D?

    1 - sufficient. 2^x*3^y = 2^3*3^2 = 72. Therefore x+y = 3+2

    2 - sufficient. 2^(x+y) = 2^5. x+y = 5

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    Stacey Koprince GMAT Instructor
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    Post Tue May 08, 2007 11:42 am
    Yep - break down the right sides of the equations to have the same bases!

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