Multiple choice

When 15 liter water is added in a solution percentage of water in solution becomes 50% from 25%. Find initial quantity of solution.

  1. 60 liter

  2. 45 liter

  3. 30 liter

  4. 75 liter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Initially, the solution is 25% water and 75% solute. Let the initial quantity be x liters. After adding 15 liters of water, water becomes 50% of (x + 15). Solving (0.25x + 15) / (x + 15) = 0.50 gives x = 30 liters. The initial water was 7.5L (25% of 30L); adding 15L makes it 22.5L out of 45L total, which is exactly 50%.

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