A fish tank with a length of 50cm, a width of 40cm, and a height of 35cm has a water depth of 25cm. After putting 2 goldfish in, the water surface rises to 25.5cm. What is the volume of each goldfish in cubic centimeters?
一个长50cm，宽40cm，高35cm的鱼缸水深25cm，放入2条金鱼后水面上升到25.5cm，每条金鱼的体积是多少立方厘米？
<gadget id="calculator">25.5 - 25</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">50 * 40 * 0.25</gadget>
<output>500</output>

<result>500</result>