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      Question

      Rice costing Rs. 60 per kg is mixed with rice costing

      Rs. 90 per kg to get a mixture worth Rs. 78 per kg. In what ratio are the two types of rice mixed?
      A 5:7 Correct Answer Incorrect Answer
      B 2:3 Correct Answer Incorrect Answer
      C 4:7 Correct Answer Incorrect Answer
      D 3:8 Correct Answer Incorrect Answer

      Solution

      Use alligation method: High price = 90 Low price = 60 Mean price = 78 Difference: 90 − 78 = 12 78 − 60 = 18 Ratio of cheaper : costlier = 12 : 18 = 2 : 3 Answer: 2 : 3

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