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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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