Question

direct and inverse proportion chapter five taps open at a same time can fill a cylindrical tank in 10 hours .if only 4 taps are open, how long will take to fill the tank?

Answer 1

Solution is in the pic

Answer 2

let the number of tap Be X
let the time be y
x×y=k inverse variation
5×10=50
x=4,y=?
x×y=k
4×y=50
y=12.5
12hrs and 30min