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      Question

      ย 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,

      โ†’ Milk = (5/7) ร— 21 = 15 L (constant). Let x = added water. (15)/(6 + x) = 5/3 โ‡’ 45 = 30 + 5x โ‡’ x = 3.

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