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Difficult Math Problem #103 - Sets

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800guy GMAT Destroyer! Default Avatar
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Difficult Math Problem #103 - Sets Post Wed Feb 28, 2007 8:16 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    Out of 20 surveyed students 8 study math and 7
    study both math and physics. If 10 students do not
    study either of these subjects, how many students
    study physics but not math?

    (A) 1
    (B) 2
    (C) 4
    (D) 5
    (E) 6

    from diff math doc. answer coming when some people respond with explanations

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    Neo2000 GMAT Destroyer!
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    Post Wed Feb 28, 2007 8:58 pm
    Look at the attached image.
    Number of people studying both M & P = 7
    Number studying ONLY M = 1
    Number NOT studying any subject = 10
    Therefore total number of students studying ONLY P = 20 -(10+1+7) = 2


    p.s. Can someone show me how to insert an image directly into the post ??
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    beatthegmat Site Admin
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    Post Wed Feb 28, 2007 9:01 pm
    Hi Neo:

    There isn't an easy way to insert images directly within posts. You have two options:

    1. Upload image as attachment, which will be viewable to members
    2. Host the image on another website and link to that image here (this will make the image appear embedded within the post)

    Thanks!

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    Neo2000 GMAT Destroyer!
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    Post Wed Feb 28, 2007 9:05 pm
    Thanks Eric.

    I was actually aiming for option 1 itself. My experience on other forums is that an attached image is usually shown at the bottom of the post but here its nice, big and bold Smile

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    Post Wed Feb 28, 2007 9:13 pm
    I'm happy you like our style here, Neo. Smile

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    800guy GMAT Destroyer! Default Avatar
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    Post Fri Mar 02, 2007 11:23 am
    here's the OA:

    total = gr1 + gr2 - both + neither
    20 = 8 + P - 7 + 10
    P = 9, 9 students study both P and M, 7 study both, 9-7 = 2 study only P

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