ArithmeticQuestion 375 of 550

A 40-litre solution contains 25% alcohol. 10 litres of water are added. What is the new alcohol percentage?

  1. 20%
  2. 25%
  3. 15%
  4. 22.5%
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Correct answer: 20%

Alcohol = 40 × 0.25 = 10 litres. New volume = 50 litres. Percentage = 10 ÷ 50 × 100 = 20%.

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Questions last reviewed: 21 October 2026