A cuboid fish tank measures 4 decimeters long and 25 centimeters wide, and holds water to a depth of 12 centimeters. After submerging 5 goldfish in the water, the height of the water surface rises to 13 cm. What is the average volume of each goldfish in cubic centimeters?
一个长方体鱼缸，从里面量长4分米，宽25厘米，所盛水的深度为12厘米．现在把5条金鱼浸没在水中后，水面高度上升到13厘米，平均每条金鱼的体积是多少立方厘米？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">13 - 12</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 * 40 * (1/5)</gadget>
<output>200</output>

<result>200</result>