A certain tank has water filled to $\frac{1}{5}$ of it's capacity. A persons opens a tap and allows the tank to fill upto to $\frac{3}{4}$ of it's capacity. Then he uses the water in the tank and finally $\frac{1}{3} $ water remains in the tank.
What I have found :
Water that was added to the tank after opening the tap : $\frac{11}{20}$
Fraction of water he used was : $\frac{5}{12}$
Total capacity of water in the tank : 1800 litres
Problem:
Find the amount water he used up in litres
How many more litres remained in the tank in the end when compared to the beginning
You solved it correctly. Just multiply the fractions by the tank capacity to find the volume of water.
$1800(3/4-1/3)=1800(5/12)=750L$
$1800(1/3-1/5)=1800(2/15)=240L$