The floor of an office is 5 meters long and its width is 2 meters shorter than its length. What is its area in square meters?
一间办公室的地面长是5米，宽比长短2米，它的面积是多少平方米．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>