Multiple choice

What quantity of water should be added to 3 liters of 10\% solution of salt, so that it becomes 5\% salt solution?

  1. 2.5 liter

  2. 3 liter

  3. 4 liter

  4. 2 liter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial solution has 3 liters × 10% = 0.3 liters of salt. Let x liters of water be added. Total volume becomes (3 + x) liters with 5% concentration: 0.3/(3 + x) = 0.05. Solving: 0.3 = 0.15 + 0.05x, so 0.15 = 0.05x, giving x = 3 liters. Adding 3 liters of water doubles the volume, halving the concentration.

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