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Question of the Day - 8th August, 2009

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quant-master Rising GMAT Star Default Avatar
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Question of the Day - 8th August, 2009 Post Fri Aug 07, 2009 11:44 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    If the operation * is one of the four Arithmatic operation addition,Subtraction,Multiplication and division.Is (6*2)*4=6*(2*4)

    A)3*2>3
    B)3*1=3

    Answers will be posted in 24 hrs time.

    Thanks,
    Quant-Master

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    tohellandback GMAT Destroyer! Default Avatar
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    Post Sat Aug 08, 2009 2:36 am
    IMO A
    1) * can be multiplication or addition. In both cases,
    SUFF

    2) * can be multiplication or division.
    not suff

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    ram_raj Just gettin' started! Default Avatar
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    Post Sat Aug 08, 2009 5:22 am
    IMO A

    S1- * can be Multiplication or Addition - Either one the answer to the question is Yes. So Sufficient

    S2-* can be Multiplication or division. - if multiplication answer to the question is Yes. If division No. So insufficient

    quant-master Rising GMAT Star Default Avatar
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    Post Sat Aug 08, 2009 10:46 am
    ram_raj wrote:
    IMO A

    S1- * can be Multiplication or Addition - Either one the answer to the question is Yes. So Sufficient

    S2-* can be Multiplication or division. - if multiplication answer to the question is Yes. If division No. So insufficient
    that's correct!

    Let me know if anybody needs further clarification.

    That's the OA.

    Thanks,
    Quant-Master

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    real2008 GMAT Destroyer! Default Avatar
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    Post Sun Aug 09, 2009 8:20 am
    ans is C

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    Brent@GMATPrepNow GMAT Instructor
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    Post Sun Jun 03, 2012 4:57 pm
    quant-master wrote:
    If the operation * is one of the four Arithmatic operation addition,Subtraction,Multiplication and division.Is (6*2)*4=6*(2*4)

    A)3*2>3
    B)3*1=3

    Answers will be posted in 24 hrs time.

    Thanks,
    Quant-Master
    Statement 1: 3 * 2 > 3

    Check each operation.

    Does * stand for addition?
    3 + 2 > 5. Yes, it might be addition

    Does * stand for subtraction?
    3 - 2 < 5. No, it can’t be subtraction

    Multiplication?
    3 x 2 > 3. Yes, it might be multiplication

    Division?
    3/2 < 3. No, it can’t be division

    So, * stands for either addition or multiplication
    If * stands for addition, does (6 + 2) + 4 = 6 + (2 + 4)? Yes
    If * stands for multiplication, does (6 x 2) x 4 = 6 x (2 x 4)? Yes
    Since both cases yield the same answer to the target question (Yes), statement 1 is SUFFICIENT.


    Statement 2: 3 * 1 = 3

    Does * stand for addition?
    3 + 1 does not equal 3. No, it can’t be be addition

    Does * stand for subtraction?
    3 - 1 does not equal 3. No, it can’t be subtraction

    Multiplication?
    3 x 1 = 3. Yes, it might be multiplication

    Division?
    3/1 = 3. Yes, it might be division

    So, * stands for either multiplication or division

    If * stands for multiplication, does (6 x 2) x 4 = 6 x (2 x 4)? Yes
    If $ stands for division, does (6/2)/4 = 6/(2/4)? No

    Since the answer to the target question can be either Yes or No, statement 2 is NOT SUFFICIENT.

    Answer = A

    Cheers,
    Brent

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