The 80 liters of mixture contains 40% of Petrol and 60% of Kerosene. In how much liters of Petrol added to the mixture, if the percentage of the kerosene in the mixture becomes 40%?
A.30 liters
B.40 liters
C.20 liters
D.50 liters
E.None of these
Sol:
Petrol = 40/100 * 80 = 32
Kerosene = 60/100 * 80 = 48
(32 + x)/48 = 60/40
2 * (32 + x) = 48 * 3
64 + 2x = 144
x = 40 liters
