Question

A vessel is full of a mixture of kerosene and petrol in which there is 18% kerosene.Eight litres are drawn off and then the vessel is filled with petrol.If the kerosene is now 15% how much does the vessel hold?
a)40 lit b)32 lit c)36lit d)48lit

Answer 1

The answer in here is d)48 lit. We know this when we do the following procedure:
kerosene=18%
so petrol =82%
after kerosene =15%
petrol=85%
so 3% =8
lit so total kerosene in the mixture =(8x18/3) =48 lit
Hope this is useful