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      Question

      In a 220 litres mixture, milk is 20% more than water. On

      adding (n - 6) litres water and (n + 6) litres milk, the milk to water ratio becomes 5:4. Find the value of 'n'.
      A 32 Correct Answer Incorrect Answer
      B 33 Correct Answer Incorrect Answer
      C 34 Correct Answer Incorrect Answer
      D 35 Correct Answer Incorrect Answer
      E 36 Correct Answer Incorrect Answer

      Solution

      Let water = a, milk = 1.2a
      ⇒ 2.2a = 220 ⇒ a = 100, Milk = 120
      Now, (120 + n + 6):(100 + n - 6) = 5:4
      ⇒ (126 + n):(94 + n) = 5:4
      ⇒ 4(126 + n) = 5(94 + n)
      ⇒ 504 + 4n = 470 + 5n
      ⇒ n = 34

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