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      Question

      There is 84 litres of a milk-water mix in the ratio 7:5.

      How much water should be added so that water becomes 75% of the final mix?
      A 110 litres Correct Answer Incorrect Answer
      B 112 litres Correct Answer Incorrect Answer
      C 114 litres Correct Answer Incorrect Answer
      D 116 litres Correct Answer Incorrect Answer

      Solution

      75% water means 25% milk.
      Milk = 84 Γ— 7/12 = 49 litres
      New total = 49 Γ· 0.25 = 196 litres
      Water in new mixture = 196 – 49 = 147 litres
      Old water = 84 – 49 = 35 litres
      Water to be added = 147 – 35 = 112 litres

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