After sawing a strip with a width of 3 decimeters from a square board, the area remaining is 108 square decimeters. What is the area of the stick in square decimeters.
从一块正方形的木板上锯下宽为3分米的一个木条以后，剩下的面积是108平方分米．木条的面积是多少平方分米．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>