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Data suffciency

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shrutib Rising GMAT Star Default Avatar
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Data suffciency Post Wed May 30, 2012 8:22 am
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  • Lap #[LAPCOUNT] ([LAPTIME])
    in the fraction x/y, x and y are positive integers, what is the value of y?

    1. The least common denominator of x/y and 1/3 is 6.

    2. x=1

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    Post Wed May 30, 2012 8:50 am
    shrutib wrote:
    in the fraction x/y, x and y are positive integers, what is the value of y?

    1. The least common denominator of x/y and 1/3 is 6.

    2. x=1
    Statement:
    The LCM of y and 3 is 6, which means that
    y = 2 or 6.
    INSUFFICIENT

    Statement(2):
    No information on y.
    INSUFFICIENT

    Let's combine the two statements.
    x = 1 and y = 2 or 6, means that
    fraction x/y = 1/2 or 1/6

    The Least Common Denominator of both 1/2 and 1/6 with 1/3 is 6.
    y = 2 or 6.
    INSUFFICIENT

    (E) is correct.

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    Post Wed May 30, 2012 9:38 am
    shrutib wrote:
    in the fraction x/y, x and y are positive integers, what is the value of y?

    1. The least common denominator of x/y and 1/3 is 6.

    2. x=1
    Look at both the statements before solving the problem!

    Start with S2, X=1, no info regarding Y. So rule out BD.
    Next S1, LCM of y and 3 is 6. y could be 2 or 2*3 ie 2 or 6. Rule out A
    Taking together,still y has 2 values. Hence E

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