Question
If the average cost price of 15 identical books
decreases by Rs. 3 after replacing one book with a new book that costs Rs. 60, what was the original cost price of the replaced book?Solution
ATQ;
Let the cost price of each book be Rs. 'x'.
So, cost price of 15 books = Rs. 15x
ATQ:
(15x - x + 60) ÷ 15 = x - 3
Or, 14x + 60 = 15x - 45
Or, x = 105
So, the cost price of the book that was removed is Rs. 105.
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