A cylinder has the same volume as a cuboid with a length of 20 decimeters, a width of 5 decimeters, and a height of 3 decimeters. If the height of the cylinder is 15 decimeters, what is the area of its base?
一个圆柱与一个长为20分米，宽5分米，高3分米的长方体体积相等．如果圆柱的高是15分米，它的底面积是多少分米．
<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

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

<result>20</result>