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      Question

      If the average cost price of 15 identical books

      decreases by Rs. 3 after replacing one book with a new book that costs Rs. 60, what was the original cost price of the replaced book?
      A Rs.250 Correct Answer Incorrect Answer
      B Rs.210 Correct Answer Incorrect Answer
      C Rs.120 Correct Answer Incorrect Answer
      D Rs.105 Correct Answer Incorrect Answer

      Solution

      ATQ;

      Let the cost price of each book be Rs. 'x'.

      So, cost price of 15 books = Rs. 15x

      ATQ:

      (15x - x + 60) ÷ 15 = x - 3

      Or, 14x + 60 = 15x - 45

      Or, x = 105

      So, the cost price of the book that was removed is Rs. 105.

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