Rakesh yadav

Question

Two vessels contain a mixture of petrol and kerosene in the ratio 4:3 and 3:5 respectively. The ratio of the volumes of the quantities from the two vessels to be mixed together so that the new mixture may contain the same volume of petrol and kerosene is 

A) 7:4	B) 9:6
C) 3:2	D) 7:8

Answer 1

The ratio of petrol to kerosene in vessel 1 is: 4:3 , So if we take x litres from it then amount of petrol=4/(4+3)*x=4x/7 similarly amount of kerosene=3x/7

If we take y litres from vessel 2 then amount of petrol is 3y/8 and amount of kerosene is 5y/8.

Given: In the mixture volume of petrol=volume of kerosene

4x/7+3y/8=3x/7+5y/8

x/7=2y/8

x/y=7/4

So the ratio in which they should be mixed is 7:4