A mixture of 40 liters has milk:water ratio 3:1. How much water to add for ratio 3:2?
A
5 liters
B
8 liters
C
10 liters
D
12 liters
Correct Answer: Option C — 10 liters
Explanation:
Milk = 30L water = 10L. New ratio 3:2 means water = (2/3)×30 = 20L. Add 20-10 = 10 liters. Mixture problems require identifying the invariant component (milk) and solving for the new amount of the variable component. Such alligation problems are extremely common in competitive exam quantitative aptitude.