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    Question

    The average price of two books, namely 'X' and 'Y' is

    Rs. 850 whereas the average price of books 'Y' and 'Z' is Rs. 910. If the average price of book 'X' and 'Z' is Rs. 875, then find the price of book 'Z'.
    A Rs.835 Correct Answer Incorrect Answer
    B Rs.735 Correct Answer Incorrect Answer
    C Rs.935 Correct Answer Incorrect Answer
    D Rs.1000 Correct Answer Incorrect Answer

    Solution

    ATQ, Let the price of book ‘X’, ‘Y’ and ‘Z’ be Rs. ‘p’, Rs. ‘q’ and Rs. ‘r’, respectively. p + q = 1700 q + r = 1820 r + p = 1750 So, 2(p + q + r) = 5270 Or, p + q + r = 2635 So, price of book ‘r’ = 2635 – 1700 = Rs. 935

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