Two cylinders with the same base area, one is 4.5 decimeters high and has a volume of 81 cubic decimeters, the other is 3 decimeters high, what is the volume of cubic decimeters?
两个底面积相等的圆柱，一个高为4.5分米，体积为81立方分米，另一个高为3分米，体积为多少立方分米．
<gadget id="calculator">81 / 4.5</gadget>
<output>18</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>