A cuboid glass tank is 70 cm long and 20 cm wide when measured from the inside, and the water depth in the tank is 16 cm. After a stone is immersed in water, the water level rises to 18 cm, find the volume of the stone.
一个长方体玻璃缸，从里面量长70厘米，宽20厘米，缸内水深16厘米．把一块石头浸入水中后，水面升到18厘米，求石块的体积．
<gadget id="calculator">18 - 16</gadget>
<output>2</output>

<gadget id="calculator">70 * 20 * 2</gadget>
<output>2_800</output>

<result>2_800</result>