In a mixture the ratio of alcohol to water is 5 : 4. If 5 litres more alcohol is added the ratio becomes 3 : 2. How many litres of alcohol was in the original mixture?
A.15 litres
B.20 litres
C.22.50 litres
D.25 litres
Answer and Feedback
Answer:D
Feedback:Let the quantity of alcohol and water in the mixture be 5x and 4x respectively.
Thus, according to the problem,
10x + 10 = 12x
or, 2x = 10
or, x = 5
quantity of alcohol = 5x = 5 * 5 = 25 litres
Thus, according to the problem,
10x + 10 = 12x
or, 2x = 10
or, x = 5
quantity of alcohol = 5x = 5 * 5 = 25 litres