cylinder of wood with a volume of 120 cubic decimeters, how many cubic decimeters of wood need to be cut to cut it into the largest cone.
一根体积为120立方分米的圆柱体木料，要把它削成最大的圆锥，需要削去多少立方分米的木料．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">120 * (2/3)</gadget>
<output>80</output>

<result>80</result>