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    Question

    If the average cost price of 12 identical tables decreases

    by Rs. 6 after replacing one table with a new table that costs Rs. 120, what was the original cost price of the replaced table?
    A Rs.170 Correct Answer Incorrect Answer
    B Rs.225 Correct Answer Incorrect Answer
    C Rs.120 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 table be Rs. 'x'.

    So, cost price of 12 tables = Rs. 12x

    ATQ:

    (12x - x + 120) ÷ 12 = x - 6

    Or, 11x + 120 = 12x - 72

    Or, x = 192

    So, the cost price of the table that was removed is Rs. 192.

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