Question
If the average cost price of 10 identical watches
decreases by Rs. 10 after replacing one watch with a new watch that costs Rs. 150, what was the original cost price of the replaced watch?Solution
ATQ;
Let the cost price of each watch be Rs. 'x'.
So, cost price of 10 watches = Rs. 10x
ATQ:
(10x - x + 150) ÷ 10 = x - 10
Or, 9x + 150 = 10x - 100
Or, x = 250
So, the cost price of the watch that was removed is Rs. 250.
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