The volume of a cone is 20 cubic meters, the height is 4 meters, what is the area of the base in square meters?
一个圆锥的体积是20立方米，高4米，底面积是多少平方米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<result>15</result>