Question 757463
If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
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As you know that the larger group of  people will complete faster than smaller group of people. Thus it is relatively inverse

Let D is number of days and N is number of men

N = k/D

6 = k/14

==>k = 6 * 14 = 84

If we have D = 21 days then

N = k/D = 84/21 = 4 men.

Hope it helps! John