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CA Foundation · Quantitative Aptitude · Ratio and Proportion, Indices and Logarithms

A mixture of 60 litres contains milk and water in the ratio 7 : 3. How many litres of water must be added so that the ratio of milk to water becomes 7 : 5?

12 litres of water must be added. The mixture has 42 litres of milk and 18 litres of water. To keep milk at 42 litres with ratio 7 : 5, water must be 30 litres, so 12 litres more are needed.

  1. A12 litresCorrect
  2. B8 litres
  3. C10 litres
  4. D15 litres

Explanation

Milk = 42 litres, water = 18 litres. For ratio 7 : 5 with milk 42, water must be 30. Water to add = 30 − 18 = 12 litres. Check: 42 : 30 = 7 : 5. The option 10 comes from wrongly using total 60 and ratio parts.

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