Xiaoming's bed is 20 decimeters long and 15 decimeters wide. A sheet of the same size as the bed should be covered. What is the area of this sheet?
小明的床长20分米、宽15分米，要铺上与床同样大小的床单，这张床单的面积应该是多少平方分米？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>