Single correct option
A vessel contains 80 litres of a mixture of milk and water in the ratio 5:3. How many litres of water must be added to change the ratio of milk to water to 5:6?
- A. 20
- B. 25
- C. 30
- D. 35
Show answer and solution
Answer: (C) 30
Milk = (5/8)×80 = 50 litres, water = (3/8)×80 = 30 litres. Milk quantity stays fixed when only water is added. Let w litres of water be added: 50/(30+w) = 5/6 → 300 = 150+5w → w = 30 litres. Check: new ratio = 50:60 = 5:6. ✓
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