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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) á 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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