The ratio of water and milk in a27 litre mixture is5:4. Find the quantity of water to be added to the…
The 27-litre mixture holds 27 × 5/9 = 15 litres of water and 12 litres of milk. Adding water leaves the milk unchanged, so a 3 : 1 ratio needs 3 × 12 = 36 litres of water.…
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The ratio of water and milk in a27 litre mixture is5:4. Find the quantity of water to be added to the mixture in order to make the ratio of water and milk as3:1.
Answer and explanation
Correct answer C
The 27-litre mixture holds 27 × 5/9 = 15 litres of water and 12 litres of milk. Adding water leaves the milk unchanged, so a 3 : 1 ratio needs 3 × 12 = 36 litres of water. The water to be added is 36 − 15 = 21 litres. 36 litres is the final quantity of water, not the amount added.
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