An iron wire can just enclose a square with a side length of 6 decimeters. If this iron wire is used to enclose a rectangle (length and width are integral decimeters), what is its maximum area?
一根铁丝正好能围成边长为6分米的正方形，如果用这根铁丝围成长方形(长、宽为整分米数)，它的最大面积是多少？
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<result>35</result>