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Math Help - No. of days.

  1. #1
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    No. of days.

    8 children and 10 men complete a certain piece of work in 9 days.Each child takes twice the time taken by a man to finish the work.In how many days will 12 men finish the same work?
    (A)8
    (b)9
    (c)12
    (d)15
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  2. #2
    Moo
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    Hello !
    Quote Originally Posted by devi View Post
    8 children and 10 men complete a certain piece of work in 9 days.Each child takes twice the time taken by a man to finish the work.In how many days will 12 men finish the same work?
    (A)8
    (b)9
    (c)12
    (d)15
    Usually, you can find in how many days a child finishes the work, etc...

    Here's how I'd do. Since each child takes twice the time than a man, we can consider that 2 children are worth 1 man.
    Hence 8 children worth 4 men. And thus 14 men would complete the piece of work in 9 days.

    14 men -> 9 days
    12 men -> ? days

    That's a cross product
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