A cone and a cylinder have the same base and height, and the volume of the cone is 20cm**3 less than that of the cylinder. What is the volume of the cylinder in cm**3.
一个圆锥与圆柱等底等高，圆锥比圆柱的体积少20cm**3圆柱的体积是多少cm**3．
<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>

<result>30</result>