Maths ( urgent help )

20 men can do a piece of work in 24 days. After working for 6 days, an additional number of men are taken to finish the work in 21 days from the beginning. Find the number of additional men .
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I tried using variation method but the answer didn't come correct :(

asked by mark
  1. in 6 days, the 20 men have done 1/4 of the work.

    One man can do 1/480 of the work in a day.

    So, if x men finish 3/4 of the work in 15 more days, that means

    x/480 * 15 = 3/4
    x = 24

    So, 4 extra men were hired.

    posted by Steve
  2. thank you very much sirr.

    posted by mark
  3. But I didn't get what the question says. 21 days from the beginning..... ??

    posted by mark

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