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      Question

      Mishti bought 20 kg apples for Rs 60 per kg, b kg apples

      for Rs 70 per kg and (b + 6) kg apples for Rs 50 per kg. She mixed all type of apples together and the average cost price of 1 kg apples is Rs 58. Find the quantity of apples that is bought at Rs 50 per kg.
      A 4 Correct Answer Incorrect Answer
      B 8 Correct Answer Incorrect Answer
      C 9 Correct Answer Incorrect Answer
      D 7 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      According to the question,
      20 × 60 + b × 70 + (b + 6) × 50 = 58 × (20 + b + b + 6)
      1200 + 70b + 50b + 300 = 58 × (26 + 2b)
      1500 + 120b = 1508 + 116b
      4b = 8
      b = 2
      Quantity of apples that is bought at Rs 50 per kg = 2 + 6 = 8 kg

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