Multiple choice general knowledge math & puzzles

In 40 litres mixture of milk and water, the ratio of milk and water is 3:1 How much water should be added in the mixture so that the ratio of milk to water becomes 2:1?

  1. 2

  2. 3

  3. 4

  4. 5

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In 40L mixture with 3:1 ratio: milk = 30L, water = 10L. Let water added = x. New ratio = 30/(10+x) = 2/1. Cross-multiply: 30 = 2(10+x) → 30 = 20+2x → 2x = 10 → x = 5L.