Question

A cistern is 1/3 full.after drawing off 18 liters it is just 1/5 full. what is the capacity the cistern?

Answer 1

Let the volume be x
Now it is filled to x/3
Now,
x/3 - 18 = x/5
x/3 - x/5 =18
2x/15 =18
x=(18x15)/2
x= 9x15
x= 135 L