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      Question

      In a 120-litre chemical mixture, the chemicals A and B

      are in the ratio 5:7. How much of chemical A must be added to make the ratio 7:7 (i.e., equal amounts)?
      A 25 litres Correct Answer Incorrect Answer
      B 35 litres Correct Answer Incorrect Answer
      C 20 litres Correct Answer Incorrect Answer
      D 12 litres Correct Answer Incorrect Answer

      Solution

      ATQ,

      Quantity of A = (5/12) × 120 = 50 litres

      Quantity of B = (7/12) × 120 = 70 litres

      Let the amount of A to be added be x litres

      Then, (50 + x) : 70 = 7 : 7

      So, 50 + x = 70

      x = 70 - 50 = 20 litres

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