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 
hours?
A swimming pool can be filled in 4 hours by 8pumps.
If we want to fill the swimming pool in 1h,
we required 4×8 = 32pumps
in 
the number of pumps required = 32
80