If the sum of the volumes of the cylinder and the cone with the same base and height is 80cm**3, what is the volume of the cone in cm**3?
等底等高的圆柱和圆锥的体积和是80cm**3，则圆锥的体积是多少cm**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">80 / (4/3)</gadget>
<output>60</output>

<gadget id="calculator">60 * (1/3)</gadget>
<output>20</output>

<result>20</result>