1. **State the problem:** A tank contains 250 liters of water. If 96 liters are used, we need to find what percentage of the original quantity is left. 2. **Formula used:** To find the percentage left, use the formula: $$\text{Percentage left} = \left(\frac{\text{Quantity left}}{\text{Original quantity}}\right) \times 100$$ 3. **Calculate quantity left:** $$\text{Quantity left} = 250 - 96 = 154 \text{ liters}$$ 4. **Calculate percentage left:** $$\text{Percentage left} = \left(\frac{154}{250}\right) \times 100 = 0.616 \times 100 = 61.6\%$$ 5. **Conclusion:** After using 96 liters, 61.6% of the original water quantity remains in the tank.