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      Question

      A lab technician has a 500-litre solution containing a mix

      of salt and water in a 9:11 ratio. If 40% of this solution is removed and replaced with an equal amount of water, what is the new ratio of salt to water in the final mixture?
      A 6:7 Correct Answer Incorrect Answer
      B 7:11 Correct Answer Incorrect Answer
      C 27:67 Correct Answer Incorrect Answer
      D 5:11 Correct Answer Incorrect Answer

      Solution

      ATQ;
      Quantity of salt in the solution = (9/20) ├Ч 500 = 225 litres
      Quantity of water in the solution = (500 тАУ 225) = 275 litres
      Quantity of solution taken out = (0.4 ├Ч 500) = 200 litres
      New ratio = {225 тАУ (225 ├Ч 0.4)} : {275 тАУ (275 ├Ч 0.4) + 200}
      = 135 : 335
      = 27:67

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