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What is the perimeter of a rectangle with length L...

This topic has 1 expert reply and 0 member replies

What is the perimeter of a rectangle with length L...

Post Wed Nov 08, 2017 10:31 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    What is the perimeter of a rectangle with length L and width W?

    1) L - W = 15
    2) L + W = 35

    The OA is B.

    Please, can any expert assist me with this DS question? I don't have it clear why that is the correct answer? I appreciate if any explain it for me. Thanks.

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    Post Wed Nov 08, 2017 6:11 pm
    Hi LUANDATO,

    We're asked for the perimeter of a rectangle with a length of L and a width of W. You can use a mix of logic and TESTing VALUES to get to the correct answer. Regardless of your approach though, you'll need the formula for perimeter of a rectangle:

    Perimeter = 2L + 2W

    1) L - W = 15

    Fact 1 doesn't provide us with the necessary information to determine the value of 2L + 2W. You can also TEST VALUES to prove the inconsistency:
    IF....
    L=16, W=1, then the perimeter is 32 + 2 = 34
    L=17, W=2, then the perimeter is 34 + 4 = 38
    Fact 1 is INSUFFICIENT

    2) L + W = 35

    Fact 2 gives us the value of L+W. If we double this equation, we'll have...
    2L + 2W = 70 and that is the exact value that we're trying to determine. You can also TEST VALUES - and you'll find that the answer is ALWAYS 70.
    Fact 2 is SUFFICIENT

    Final Answer: B

    GMAT assassins aren't born, they're made,
    Rich

    _________________
    Contact Rich at Rich.C@empowergmat.com

    Thanked by: LUANDATO

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