Q:
Application of Inverse Proportion
If 20 persons can do a piece of work in 7 days then calculate the number of persons require to complete the work in 28 days
Answer
Number of persons * days = work
20 * 7 = 140 man- days
Now, x * 28 = 140 men- days
=> x =5
Therefore in second case the required number of person is 5.
Second method:
Since work is constant, therefore M1 x D1= M2 x D2
20 x 7 = M2 x 28
=> M2 = 5
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