If the volume of a cone is 20 cubic decimeters and the height is 12 decimeters, what is the area of its base?
一个圆锥的体积是20立方分米，高是12分米，它的底面积是多少平方分米．
<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * (1/4)</gadget>
<output>5</output>

<result>5</result>