Question

If four persons can finish an assignment in 15 days. How many persons will be required to finish the same assignment in 20 days?
Full solution ​

Answer 1

Answer:

Let the amount of work be W

If a person finishes the work in 15 days

Then amount of work in 1 day by 1 person = W/15

Amount of work done by 3 person per day = 3*W/15 = W/5

So total days to be taken by 3 persons = W/(W/5)

= 5 days

Answer 2

Answer:

it's the question of inverse proportion means if number of persons increases the days decreases

means a×b=c×d

15×4=x×20

x=3 days