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    Question

    If the average cost price of 10 identical watches

    decreases by Rs. 10 after replacing one watch with a new watch that costs Rs. 150, what was the original cost price of the replaced watch?
    A Rs.170 Correct Answer Incorrect Answer
    B Rs.225 Correct Answer Incorrect Answer
    C Rs.250 Correct Answer Incorrect Answer
    D Rs.192 Correct Answer Incorrect Answer

    Solution

    ATQ;

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

    So, cost price of 10 watches = Rs. 10x

    ATQ:

    (10x - x + 150) ÷ 10 = x - 10

    Or, 9x + 150 = 10x - 100

    Or, x = 250

    So, the cost price of the watch that was removed is Rs. 250.

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