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Please help (8^2)(3^3)(2^4)/(96^2) GMAC Problem

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KingTmo Just gettin' started! Default Avatar
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Please help (8^2)(3^3)(2^4)/(96^2) GMAC Problem Post Sat Jun 19, 2010 12:40 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    Please help with this as the GMAC problems have no solution. I know its easy but, I still need help!!! Thanks

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    amising6 Really wants to Beat The GMAT!
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    Post Sat Jun 19, 2010 12:56 pm
    KingTmo wrote:
    Please help with this as the GMAC problems have no solution. I know its easy but, I still need help!!! Thanks
    (8^2)(3^3)(2^4)/(96^2)
    8^2= (2*2*2)^2=(2^3)^2=2^6 (since (a^m)^n=a^mn)

    96^2=(2*2*2*2*2*3)^2=(2^5*3)^2=2^10* 3^2

    now (8^2)(3^3)(2^4)/(96^2)
    (2^6)(3^3)(2^4)/2^10* 3^2 (a^b+a^c =a(b+c))
    2^10*3^3/2^10* 3^2
    =3

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    intellijat Just gettin' started!
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    Post Mon Jun 21, 2010 7:47 am
    Quote:
    Please help (8^2)(3^3)(2^4)/(96^2) GMAC Problem
    hi........
    it would do you a world of good to memorize squares/cubes of numbers at least up to 20

    8^2=8*8=64
    3^3=3*3=27
    2^4=2*2*2*2=16
    96^2=96*96
    simply solve to get the the answer=3

    also remember
    2^2=4
    2^3=8
    2^4=16
    2^5=32
    2^6=64
    can you see the relation ?

    dinesh19aug Rising GMAT Star Default Avatar
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    Post Mon Jul 12, 2010 3:38 pm
    For solving this question you should not multiply the numbers. There is quick way and smart way(if you are not able to do it quick)

    Quick way : As intellijat mentioned above. However if you do not remember the square of the number then do not make the mistake of mutiplying (8^2)(3^3)(2^4)/(96^2) .

    For this sort of quetion you can simply reduce it to simplest fraction and and divide in parts. EX - 8^2 / 2^2

    8 * 8 / 2 * 2 = 4 * 4 = 16.

    You can do the same for the actual problem as well.

    ankitc Just gettin' started! Default Avatar
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    Post Wed Jul 14, 2010 12:55 am
    its simple....first check the highest numbers.....8^2 and 96^2

    now 96/8=12, so in d denominator we have 12^2 instead of 96 if we factor out 8 from the numerator

    2^4 = 4^2 now that goes very well with 12^2 in the denom.........giving us 3^2
    So we are now left with

    3^3/ 3^2 = 3 very simple.......voila!! Smile Cheers

    strivedi Just gettin' started! Default Avatar
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    Post Sat Apr 21, 2012 9:09 pm
    For this problem easiest way was to simplify using the exponent rule:
    (8^2)(3^3)(2^4)/(96^2)

    This can be rewritten in powers of 2 by the following, 96 has the prime factorization of 2^5 x 3:
    [(2^3)^2 } (3^3)(2^4)/(2^5*3)^2

    Now combine like terms and powers:
    2^(6+4) (3^3)/(2^10*3^2)

    Here the 2^10 can cancel out and we're left with:
    3^3/3^2
    which leaves us with answer of 3

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