A cuboid tank with a length of 35 cm and a width of 20 cm has a water depth of 8 cm. After placing a cube stone, the water depth is 13 cm. What is the volume of the stone?
一个长35厘米，宽20厘米的长方体水槽中水深8厘米，放入一正方体石块后，水深13厘米，这石块的体积是多少？
<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">20 * 35 * 5</gadget>
<output>3_500</output>

<result>3_500</result>