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Exponent algebra

This topic has 1 member reply
ash_maverick Senior | Next Rank: 100 Posts Default Avatar
Joined
07 Jan 2007
Posted:
31 messages

Exponent algebra

Post Wed Feb 28, 2007 8:23 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    x and y are positive integers.if [5^x]-[5^y]=[2^(y-1)][5^x] , what is the value of xy?

    (A) 48
    (B) 36
    (C) 24
    (D) 18
    (E) 12--ans

    Please explain
    corrected...sorry for the misstake.

    please provide the explanation...



    Last edited by ash_maverick on Thu Mar 01, 2007 11:32 am; edited 2 times in total

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    jayhawk2001 Community Manager
    Joined
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    Post Wed Feb 28, 2007 10:24 pm
    Please post the source of your question.

    I'm guessing the word missing here is "consecutive" positive integers,
    in which case only 3*4 = 12 would make the cut. Else, it would be impossible to find out xy from just "positive integers" especially since
    all the answers are products of 2 positive integers.


    [quote="ash_maverick"]x and y are positive integers. , what is the value of xy?

    (A) 48
    (B) 36
    (C) 24
    (D) 18
    (E) 12--ans

    Please explain[/quote]

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