Multiple choice

A mixture of 70 liters of milk and water contains 20% milk. What quantity of water should be added to the mixture to increase the percentage of water by 25% in the new mixture?

  1. 20 liters

  2. 14 liters

  3. 18 liters

  4. 16.8 liters
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

70L mixture has 20% milk = 14L milk, 56L water (80% water). Adding x liters water gives (56+x)L water in (70+x)L total. New water percentage = (56+x)/(70+x). We want 25% increase from 80%, so new percentage = 100% (since 80×1.25=100). So (56+x)/(70+x)=1, giving x=14L.

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