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    Question

    If the average cost price of 18 identical bags decreases by

    Rs. 5 after replacing one bag with a new bag that costs Rs. 90, what was the original cost price of the replaced bag?
    A Rs.180 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
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;

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

    So, cost price of 18 bags = Rs. 18x

    ATQ:

    (18x - x + 90) ÷ 18 = x - 5

    Or, 17x + 90 = 18x - 90

    Or, x = 180

    So, the cost price of the bag that was removed is Rs. 180.

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