cube glass container, pour 4 liters of water into it, the water surface is 8 cm high, and then put a stone into the water, then measure the water depth in the container to be 13 cm. Find the volume of the stone.
一个正方体玻璃容器，往里面倒入4升的水，水面高8厘米，再把一块石头放入水中，这时量得容器内的水深13厘米．求石头的体积．
<gadget id="calculator">1_000 / 8</gadget>
<output>125</output>

<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">4 * 125 * 5</gadget>
<output>2_500</output>

<result>2_500</result>