The ratio of water and milk in a 27 litre mixture is 5:4. Find the quantity of water to be added to the mixture in order to make the ratio of water and milk as 3:1.
A12 litres
B15 litres
C21 litres ✓ Correct
D36 litres
Correct answer: (C) 21 litres
Explanation
21 litres of water must be added.
In 27 litres at 5:4, water = 15 and milk = 12.
Milk stays 12; the new ratio needs water:milk = 3:1.
(15 + x)/12 = 3, so 15 + x = 36.
x = 21 litres.
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