A cylindrical wood with a volume of 120 cubic centimeters is cut into the largest cone, how many cubic centimeters are cut off than the rest.
将一个体积是120立方厘米的圆柱形木料削成一个最大的圆锥，削去的比剩下的多多少立方厘米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">120 * (1/3)</gadget>
<output>40</output>

<result>40</result>