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A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?

Correct answer: C. 10 liters

  • A. 7 liters
  • B. 15 liters
  • C. 10 liters
  • D. 9 liters

Explanation

The original 150 litres contains 20% water = 30 litres of water and 120 litres of wine. If x litres of water are added, (30 litres + x litres) / (150 litres + x litres) = 25/100, so 30 + x = 37.5 + 0.25x and x = 10 litres. The likely mistake is option b, 15 litres, from taking 25% of the original 150 litres instead of the new total.

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