At 8 o'clock yesterday morning, the water level of a certain reservoir reached 14.4 meters, 0.64 meters higher than the warning water level. How many meters is the warning water level of this reservoir? (solution with equation)
昨天上午8时，某水库的水位达14.4米，超过警戒水位0.64米，这个水库的警戒水位是多少米？(用方程解答)
<gadget id="calculator">14.4 - 0.64</gadget>
<output>13.76</output>

<result>13.76</result>