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      Question

      A tank contains petrol and diesel in the ratio 9:5. If

      10% of the mixture is removed and replaced with diesel, what is the new ratio of petrol to diesel?
      A 15:11 Correct Answer Incorrect Answer
      B 11:17 Correct Answer Incorrect Answer
      C 15:13 Correct Answer Incorrect Answer
      D 17:10 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total quantity = 14x litres Petrol = 14x Γ— (9/14) = 9x litres Petrol left = 9x Γ— 0.9 = 8.1x litres Diesel = 14x - 8.1x = 5.9x litres Required ratio = 8.1x : 5.9x = 81 : 59

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