Uncle Li inserted a 3-meter-long bamboo pole vertically into the water. The part of the bamboo pole that entered the mud was 0.5 meters, and the part that was out of the water was 0.2 meters. How deep is the water?
李叔叔把一根3米长的竹竿竖直插入水中，竹竿入泥部分是0.5米，露出水面部分是0.2米，水深多少米？
<gadget id="calculator">3 - 0.5 - 0.2</gadget>
<output>2.3</output>

<result>2.3</result>