wooden cylinder is processed into the largest cone, and the volume is reduced by 20 cubic centimeters. What is the volume of the finished cone in cubic centimeters?
把一个木质圆柱加工成最大的圆锥，体积比原来减少了20立方厘米．加工成的圆锥的体积是多少立方厘米．
<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">20 / (2/3)</gadget>
<output>30</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<result>10</result>