The volume of a cone is 15 cubic decimeters, the height is 3 decimeters, what is the area of the base in square decimeters?
一个圆锥的体积是15立方分米，高是3分米，底面积是多少平方分米．
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">15 * 1</gadget>
<output>15</output>

<result>15</result>