Single correct option
A vessel contains 60 litres of a mixture of milk and water in the ratio 7 : 3. How many litres of water must be added to make the ratio of milk to water 3 : 2?
- A. 12
- B. 15
- C. 8
- D. 10
Show answer and solution
Answer: (D) 10
Milk = 7/10 × 60 = 42 L and water = 18 L. Adding water leaves the amount of milk unchanged.
In the new mixture milk : water = 3 : 2, so water = 42 × 2/3 = 28 L.
Water to add = 28 − 18 = 10 litres.
Tip: Always anchor on the component that does not change (here, milk) and scale the ratio to it.
In the new mixture milk : water = 3 : 2, so water = 42 × 2/3 = 28 L.
Water to add = 28 − 18 = 10 litres.
Tip: Always anchor on the component that does not change (here, milk) and scale the ratio to it.
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