A cuboid glass cylinder measures 40cm in length, 25cm in width and 16cm in height. The depth of the water inside is 12cm. After a stone is fully immersed in water, the water overflows by 40cm**3, find the volume of the stone.
一个长方体玻璃缸，从里面量长40cm，宽25cm，高16cm．里面水的深度为12cm．把一块石头全部浸入水中后，水溢出了40cm**3，求石头的体积．
<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">40 * 25 * 4</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 + 40</gadget>
<output>4_040</output>

<result>4_040</result>