A tank contains 3000 L water. 900 L is used and 400 L is added. Find the final quantity.

Explanation

Initially, the tank contains 3000 L water. 900 L is used, so the remaining quantity is 3000 - 900 = 2100 L. Then, 400 L is added, so the final quantity is 2100 + 400 = 2500 L. However, the question asks for the final quantity, which should be 2500 L, but the answer is 2400 L. This seems to be an error in the question.

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