A cuboid wood has a square cross section. If the length is cut off by 6 cm, the surface area will be reduced by 120 square centimeters, and the volume of this wood will be reduced by how many cubic centimeters.
一根长方体木料横截面是正方形，如果长截去6厘米，表面积就减少120平方厘米，这根木料的体积则减少多少立方厘米．
<gadget id="calculator">120 / 4 / 6</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 6</gadget>
<output>150</output>

<result>150</result>