Question

A swimming pool can be filled in 4 hours by 8 pumps of same type. How many such pumps are required if the pool is to be filled in 25 hrs

Answer 1

Answer:

1.28 pumps will be required.

Step-by-step explanation:

Amount of work 8 pumps can do in 1 hour = 1/4

Amount of work 1 pump can do in 1 hour = 1/(4 × 8) = 1/32

Let us say that the number of required pumps is x.

Then,

Amount of work x pumps can do in 1 hour = x/32 = 1/25

x/32 = 1/25

x = 1.28