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Math Help - Fractions

  1. #1
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    Fractions

    If 2/9 of a number is 36, then the number is

    A) 162 (B)8 (C)324 (D)648
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  2. #2
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    Re: Fractions

    The proper way to do this is to set up an equation for the number you're trying to find. Any thoughts on what that equation might be?
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  3. #3
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    Re: Fractions

    iv worked this one out. 162/36 dived by 2 = 81/18 divided by 9 = 9/2 thanks mate
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  4. #4
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    Re: Fractions

    Yes, that's right- though this is a strange way of putting it! It took me a moment to realize that you were using "/" as a 'separator', not meaning division. You are saying, "The answer is 162. 36 divided by 2 = 18." (not "81"- that was a typo). But now I am confused. You say "18 divided by 9 is 2." And therefore ???? Where did "162" come from.

    In fact, the problem is "2/ 9 of a number is 36". That is, if you multiply a number by 2 and then divide by 9, you get 36. Okay, to go back to the number work backwards! Instead of multiplying by 2, divide by 2: 36 divided by 2 is 18, just as you say. Instead of dividing by 9, multiply by 9: 18 times 9 is 162.
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  5. #5
    Newbie rudsdiey's Avatar
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    Re: Fractions

    Hi Spixol,

    i would suggest you to put an equation (as per john advised) rather than try one by one.

    let substitute the number as x, then;

    2/9 of x = 36
    or
    2/9 * x = 36

    x = 36*9/2

    x= 162


    cheers...
    Thanks from Spixol123
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