Question

A swimming pool can be filled in 4 hours by 8 pumps of the same type how many such pumps are required, if the pool is to be filled in $2\frac{2}{3}$ hours?

Answer 1

A swimming pool can be filled in 4 hours by 8 pumps.
if we want to fill the swimming pool in 1 h , we required $4\times 8=32$ pumps
in $2\frac{2}{3}$ i.e. $\frac{8}{3}$ h. the number of pumps required $=32÷\frac{8}{3}=\frac{32\times 3}{8}=4\times 3=12$ pumps