Multiple choice

If 50 L of milk solution has 40% milk in it, then how much milk should be added to make it 60% in the solution?

  1. 20 L

  2. 25 L

  3. 28 L

  4. 30 L
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial solution: 50 L with 40% milk = 20 L milk + 30 L water. Let x L of pure milk be added. New concentration = (20+x)/(50+x) = 60/100. Solving: 20+x = 30 + 0.6x, so 0.4x = 10, giving x = 25 L. Adding 25 L of milk increases the concentration to 60%.

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