A mixture containing 20% of acid is mixed with another mixture containing 80% of acid in the ratio x : y. If the quantity of acid in the final mixture is 32%, find the ratio x : y.

Correct Answer: 4 : 1
The ratio in which the liquids are mixed = x : y. X : y = (80 – 32) : (32 – 20) = 48 : 12 = 4 : 1