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      Question

      The average number of taxis of three colours (black,

      white and yellow) in a taxi stand is 140. The number of black taxis is 50 more than that of yellow taxis. The total number of black and white taxis is 280. Find the number of white taxis in a taxi stand.
      A 50 Correct Answer Incorrect Answer
      B 60 Correct Answer Incorrect Answer
      C 70 Correct Answer Incorrect Answer
      D 90 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the number of white taxis be ‘x’ Therefore, number of black taxis = (280 – x) Number of yellow taxis = (280 – x – 50) = (230 – x) According to the question, 230 – x + 280 – x + x = 140 × 3 Or, x = 90

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