Multiple choice

When 18 litre water is added in a mixture percentage of water increased from 25\% to 40\%. Find the quantity of water in the mixture initially?

  1. 18 litre

  2. 25 litre

  3. 15 litre

  4. 24 litre

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let initial mixture be M liters. Water = 0.25M, other = 0.75M. After adding 18L water: (0.25M + 18)/(M + 18) = 0.40. Solving: 0.25M + 18 = 0.40M + 7.2, so 10.8 = 0.15M, M = 72L. Initial water = 0.25 × 72 = 18L.

Keep practicing — related questions