CMA Foundation · Fundamentals of Business Mathematics and Statistics · Ratios, Variations and Proportions
The ratio of milk to water in a 60-litre mixture is 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. Keeping milk fixed, a 7:5 ratio needs 30 litres of water, so the addition is 30 minus 18, which equals 12 litres.
- A12 litresCorrect
- B8 litres
- C10 litres
- D15 litres
Explanation
Milk = 42 litres and water = 18 litres. For a 7:5 ratio with 42 litres of milk, water must be 30 litres. Water to add = 30 − 18 = 12 litres. Adding 8 litres would give 42:26, not 7:5.
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