Uncle Wang inserted a 3-meter-long bamboo pole vertically into his fish pond. The part of the bamboo pole that enters the mud is 0.5 meters, and the part that is exposed to the water is 0.75 meters. How deep is the pond?
王大伯把一根长3米的竹竿垂直插入自家的鱼塘中．竹竿的入泥部分是0.5米，露出水面的部分是0.75米．鱼塘水深多少米？
<gadget id="calculator">3 - 0.5 - 0.75</gadget>
<output>1.75</output>

<result>1.75</result>