A cylinder and a cone have the same base area and the same height. The sum of their volumes is 20 cubic centimeters, what is the volume of the cone in cubic centimeters?
一个圆柱和一个圆锥的底面积相等，高也相等．它们的体积之和是20立方厘米，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>4/3 = around 1.333333</output>

<gadget id="calculator">20 / (4/3)</gadget>
<output>15</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<result>5</result>