Question

If 5 persons can do a piece of work in 28 days then the number of persons to do work in 7 days are

Answer 1

Step-by-step explanation:

5 persons can work 28 days

So,x persons can work 7days

5*28=x*7

5*28/7=x

20=x

x=20persons

Therefore,20 persons can work in 7 days

Answer 2

Given,

5 persons can do a piece of work in 28 days.

To find,

We have to find the number of persons to do work in 7 days.

Solution,

The number of persons to do work in 7 days are 20.

We can simply solve the given question by using the concept of inverse variation.

Let the total number of persons required to do work in 7 days be 'x'.

This is a case of inverse variation, as the number of persons increases, less number of days will be taken to complete the work.

Then,  5×28 = x×7

      5× 28 /7 = x

               20 = x

Hence, if 5 persons can do a piece of work in 28 days then the number of persons to do work in 7 days are 20.