If the volume of a cone is 15 cubic meters and the height is 3 meters, what is the area of its base in square meters?
一个圆锥体的体积是15立方米，高是3米，它的底面积是多少平方米．
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

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

<result>15</result>