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      Question

      A 400 ml mixture consists of 30% alcohol. Find how much

      alcohol must be added so that alcohol makes up 50% of the new mixture.
      A 172 ml Correct Answer Incorrect Answer
      B 122 ml Correct Answer Incorrect Answer
      C 160 ml Correct Answer Incorrect Answer
      D 127 ml Correct Answer Incorrect Answer

      Solution

      ATQ,

      Alcohol in the current mixture = 0.30 × 400 = 120 ml

      Let added alcohol be ‘x’ ml

      So, 120 + x = 0.50 × (400 + x)

      Or, 120 + x = 200 + 0.50x

      Or, 0.50x = 80

      So, x = 80 / 0.50 = 160 ml

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