A cube glass tank, the length of the side measured from the inside is 40 cm, and the water depth in the tank is 12 cm. If a stone is immersed in water and the water rises to 25 cm, what is the volume of the stone in cubic centimeters?
一个正方体玻璃缸，从里面量棱长是40厘米，缸内水深12厘米．把一块石块浸入水中后，水面上升到25厘米，石块的体积是多少立方厘米？
<gadget id="calculator">25 - 12</gadget>
<output>13</output>

<gadget id="calculator">40 * 40 * 13</gadget>
<output>20_800</output>

<result>20_800</result>