Question

There are 12 pipes that are connected to a tank. Some of them are
fill pipes and the others are drain pipes. Each of the fill pipes can
fill the tank in 8 hours and each of the drain pipes can drain the
tank completely in 6 hours. If all the fill pipes and the drain pipes
are kept open, an empty tank gets filled in 24 hours. How many of
the 12 pipes are fill pipes?

Answer 1

let x pipes are fill pipes
so
(x/8)-((12-x)/6)=1/24
on solving x=7 ans

Answer 2

Answer:

Step-by-step explanation:

The explanation is as follows:

May x pipes fill the tank.

So,(12-x) pipes empty the tank.