A rectangular parallelepiped glass tank measures 40 cm in length and 4 decimeters in width from the inside. The water depth in the tank is 12 cm. After a stone is immersed in the water, the water surface rises to 16 cm. What is the volume of the stone?
一个长方体玻璃缸，从里面量得长40厘米，宽4分米，缸内水深12厘米，把一块石头浸入水中后，水面升到16厘米，求石头的体积？
<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">4 * 10 * 4 * 10 * 4</gadget>
<output>6_400</output>

<result>6_400</result>