Question

A 210 litres mixture contains only water and phenyl in the ratio 3:4, respectively. If 70 litres of this mixture is replaced with 25 litres of alcohol, then what will be the ratio of quantity of water to that of alcohol in the resultant mixture?

A 11:5 Correct Answer Incorrect Answer
B 12:7 Correct Answer Incorrect Answer
C 12:5 Correct Answer Incorrect Answer
D 8:5 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

Initial quantity of water in the mixture = 210 × (3/7) = 90 litres After removing 70 litres of the mixture, quantity of water = (210 – 70) × (3/7) = 140 × (3/7) = 60 litres Therefore required ratio = 60:25 = 12:5

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