Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2023 (12.12.2023) Shift-I
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 — The quantity of water to be added is 21 litres, so that is the answer.
Explanation
★The quantity of water to be added is 21 litres, so that is the answer.
★In the 27 litre mixture the ratio of water to milk is 5 to 4.
★So water is 5 by 9 of 27, which is 15 litres, and milk is 12 litres.
★Let x litres of water be added to make the new ratio 3 to 1.
★Then 15 plus x over 12 equals 3, so 15 plus x is 36.
★Solving gives x equal to 21 litres.
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