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is rst 1?

This topic has 3 expert replies and 1 member reply
kobel51 Master | Next Rank: 500 Posts Default Avatar
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is rst 1?

Post Sat Dec 21, 2013 3:43 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Is rst=1 ?

    1) rs=1

    2) st=1

    how do you evaluate the statements together?

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    Post Sat Dec 21, 2013 4:26 pm
    kobel51 wrote:
    Is rst=1 ?
    1) rs=1
    2) st=1
    Target question: Is rst=1?

    Statement 1: rs = 1
    No information about t
    INSUFFICIENT

    Statement 2: st = 1
    No information about r
    INSUFFICIENT

    Statements 1 and 2 combined
    So, rs = 1 and st = 1
    This means that rs/st = 1/1
    Simplify to get r/t = 1
    This tells us that r = t, so this is all that we can conclude one we combine the statements.

    If r = t, there are still several values of r, s and t that satisfy the both statements. Here are two:
    Case a: r = 1, s = 1 and t = 1, in which case rst = 1
    Case b: r = 0.5, s = 2 and t = 0.5, in which case rst = 0.5
    Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

    Answer = E

    Cheers,
    Brent

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    GMAT/MBA Expert

    Post Sat Dec 21, 2013 4:31 pm
    The solution below is taken from the GMATFix App.



    -Patrick

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    vipulgoyal Master | Next Rank: 500 Posts Default Avatar
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    Post Tue Dec 24, 2013 2:18 am
    can different variables represent the same number and same varible represents two differ numbers ????

    GMAT/MBA Expert

    Post Tue Dec 24, 2013 2:32 am
    Yes. Each variable has a specific value (that's why from x^2=1, we don't know what x is), but two variables can share the same value.

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    Thanked by: vipulgoyal

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