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 15 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15厘米，石块的体积是多少立方厘米？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">40 * 40 * 3</gadget>
<output>4_800</output>

<result>4_800</result>