Maths ( urgent help )
posted by mark .
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 :(

Maths ( urgent help ) 
Steve
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. 
Maths ( urgent help ) 
mark
thank you very much sirr.

Maths ( urgent help ) 
mark
But I didn't get what the question says. 21 days from the beginning..... ??
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