The ratio of milk and water in a mixture is 3:7 . If we add 10 litres of water to the mixture, then the ratio becomes 1:3 . Find the initial quantity - Quantitative Aptitude MCQ Competitive Exam 2026 | ExamTest.live

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The ratio of milk and water in a mixture is 3 : 7 . If we add 10 litres of water to the mixture, then the ratio becomes 1 : 3 . Find the initial quantity of milk.

Solution & Step-by-step Explanation

Let the initial quantity of milk be 3 x and water be 7 x . According to the question, 10 litres of water is added to the mixture: \frac{3 x}{7 x + 10} = \frac{1}{3} Cross-multiplying to solve for x : 3 \times 3 x = 1 \times (7 x + 10) 9 x = 7 x + 10 2 x = 10 x = 5 The initial quantity of milk is: Initial Milk = 3 x = 3 \times 5 = 15 litres

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The ratio of milk and water in a mixture is 3 : 7 . If we add 10 litres of water to the mixture, then the ratio becomes 1 : 3 . Find the initial quantity of milk.

10 litres

15 litres

11 litres

13 litres

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