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Math Help - how do i work this out?

  1. #1
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    Question how do i work this out?

    each cat will eat 3/4 of a tin of food every day

    paul is going to be away for 7 days

    what is the least number of tins needed to feed 2 cats
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by starslacker View Post
    each cat will eat 3/4 of a tin of food every day

    paul is going to be away for 7 days

    what is the least number of tins needed to feed 2 cats

    one cat eats \frac {3}{4} tins of food per day

    so two cats will eat 2 \times \frac {3}{4} = \frac {3}{2} tins of food per day

    so for 7 days, the cats will eat 7 \times \frac {3}{2} = 10 \frac {1}{2} tins of food

    so need need to have at least 11 tins of food
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  3. #3
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    Quote Originally Posted by starslacker View Post
    each cat will eat 3/4 of a tin of food every day

    paul is going to be away for 7 days

    what is the least number of tins needed to feed 2 cats
    only one cat can have 7*3/4=51/4 in 7 days such that 2 cat can have 2*51/4=101/4tins in seven days
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by asurekha1970 View Post
    only one cat can have 7*3/4=51/4 in 7 days such that 2 cat can have 2*51/4=101/4tins in seven days
    No, because (7)(\frac{3}{4}) = \frac{21}{4} and not \frac{51}{4}
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  5. #5
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    Quote Originally Posted by starslacker View Post
    each cat will eat 3/4 of a tin of food every day

    paul is going to be away for 7 days

    what is the least number of tins needed to feed 2 cats
    1 cat eats 3/4th of a tin per day

    ==> 1 cat eats 0.75 tins per day

    ==> 2 cats eat 0.75 * 2 = 1.5 tins per day


    Mahurshi Akilla
    ==> For 7 days, 1.5 tins/day * 7 days = 1.5 * 7 tins = 10.5 tins = 10 1/2 tins
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  6. #6
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by janvdl View Post
    No, because (7)(\frac{3}{4}) = \frac{21}{4} and not \frac{51}{4}
    This is why I hate the 7 \frac{3}{4} notation for \frac{31}{4}. The notation ought to be retired.

    -Dan
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  7. #7
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by topsquark View Post
    This is why I hate the 7 \frac{3}{4} notation for \frac{31}{4}. The notation ought to be retired.

    -Dan
    completely agree with you. but it was ot notation that messed asurekha1970 up here, he simply made an error
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