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    Question

     A mixture has milk and water in ratio 5:2. How much

    water must be added to 21 L of this mixture to make the ratio 5:3?
    A 1 litres Correct Answer Incorrect Answer
    B 3 litres Correct Answer Incorrect Answer
    C 8 litres Correct Answer Incorrect Answer
    D 12 litres Correct Answer Incorrect Answer

    Solution

    ATQ,

    → Milk = (5/7) × 21 = 15 L (constant). Let x = added water. (15)/(6 + x) = 5/3 ⇒ 45 = 30 + 5x ⇒ x = 3.

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