long iron wire can be used to form a square with a side length of 7 cm. If this wire is used to form a rectangle with a length of 10 cm, what is the width?
用一根长铁丝可以围成一个边长7厘米的正方形，如果将这根铁丝围成一个长10厘米的长方形，宽是多少？
<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 - 10</gadget>
<output>4</output>

<result>4</result>