Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2023 (12.12.2023) Shift-II
How much water, free of cost, should be added to 18 litres of milk worth Rs 70 per litre so that the value of the mixture is Rs 60 per litre?
A2 litres
B3 litres ✓ Correct
C4 litres
D5 litres
Correct answer: (B) 3 litres — The water to be added is 3 litres, so that is the answer.
Explanation
★The water to be added is 3 litres, so that is the answer.
★The total value of the milk is 18 litres times Rs 70, which is Rs 1260.
★Adding water does not change the total value, since water is free.
★Let x litres of water be added, making the mixture 18 plus x litres.
★So 1260 equals 60 times 18 plus x, giving 60x equal to 180.
★Solving gives x equal to 3 litres.
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