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What is 11% of x?

This topic has 3 expert replies and 0 member replies

What is 11% of x?

Post Fri Nov 10, 2017 6:33 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    What is 11% of x?

    (1) 3/8 of x is 24

    (2) 5% of x is 3.2

    The OA is D .

    How can I use ach statement to calculate 11%*x ? Experts can you help me please?

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    Post Fri Nov 10, 2017 6:49 am
    With DS, it's important to ask: "what is the MINIMUM piece of information that would be sufficient to answer the question?"

    If the question is "what is 11% of x," we would need to know the value of x to solve. Thus, knowing the value of x would be sufficient.

    Rephrased question: what is the value of x?

    (1) 3/8 of x is 24
    Don't do the math here! Just think - can we get a value for x? Yes! We could create a simple equation and solve: x = (8/3)(24). Don't even calculate - this must be sufficient.

    (2) 5% of x is 3.2
    The same idea holds true here. Don't do the math - we can see that we're going to get one - and only one - value for x. Sufficient.

    The answer is D.

    _________________


    Ceilidh Erickson
    Manhattan Prep GMAT & GRE instructor
    EdM in Mind, Brain, and Education
    Harvard Graduate School of Education


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    Post Fri Nov 10, 2017 6:53 am
    Try this technique on a similar problem. This one is #240 in OG 2017:

    Quote:
    What is the cube root of w ?

    (1) The 5th root of w is 64.

    (2) The 15th root of w is 4.
    OA: D

    _________________


    Ceilidh Erickson
    Manhattan Prep GMAT & GRE instructor
    EdM in Mind, Brain, and Education
    Harvard Graduate School of Education


    Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
    Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

    Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.

    GMAT/MBA Expert

    Post Fri Nov 10, 2017 1:15 pm
    To solve, we need the value of x.

    S1:: gives us the value of x, sufficient

    S2:: gives us the value of x, also sufficient

    If you're having trouble with this one, I'd recommend doing more skillbuilding in algebra before trying too many CATs or assorted problems. Once your fundamentals are solid, come back to them, but make sure you're comfortable with the foundations first.

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