There is a cuboid wooden box with a length of 7 decimeters, a width of 5 decimeters, and a height of 3 decimeters. How to put it, the wooden box occupies the smallest area? What is the smallest square decimeter?
有一个长方体木箱，长7分米，宽5分米，高3分米，怎么放，这个木箱的占地面积最小？最小是多少平方分米？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>