Question

20 pumps of equal capacity can fill a tank in 7 days then how many more such pumps will be required to fill the tank in 5 days?

Answer 1

20 pumps of equal capacity can fill a tank in 7 days

to fill  tank in 5 days

20 x 7/5 - 20

=140/5-20

=28-20

=8

8 more such pumps will be required to fill the tank in 5 days