In a rectangular parallelepiped measuring cup with a length of 6 cm and a width of 4 cm, water is filled to a height of 4 cm. After putting a stone, the water height is 7cm. Find the volume of this stone.
在一个长6cm，宽4cm的长方体量杯中，装了4cm高的水．放入一块石头后，水高7cm．求这块石头的体积．
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">6 * 4 * 3</gadget>
<output>72</output>

<result>72</result>