Question

a drum is 2/5 full if 75 litre is added to fill to it what is thecapacity of the drum

Answer 1

if 2/5part is filled then remaining part = 1-2/5= 3/5
A/q
3/5 part of drum = 75l
1(full)part of drum = 75l *5/3
= 25*5l
= 125l (Ans.)

Answer 2

let capacity of tank be x
so
ATQ
2/5×x+75=x
or 75=x- 2/5x
or75=3/5x
or x=(75×5)/3
or x=125 litres
hence,
capacity of tank =125 litres