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    Question

    The average cost price of 21 pens (having equal cost

    price) decreased by Rs.3, when one of the pen is replaced by a new pen having cost price of Rs.55. Find the cost price of the pen that was replaced.
    A Rs.120 Correct Answer Incorrect Answer
    B Rs.110 Correct Answer Incorrect Answer
    C Rs.118 Correct Answer Incorrect Answer
    D Rs.100 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the cost price of each pen be Rs.x So, cost price of 21 pens = Rs.21x According to the question, => (21x тАУ x + 55)/21 = x тАУ 3 => 20x + 55 = 21x тАУ 63 => x = 118 Therefore, the cost price of the pen that was replaced is = Rs.118

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