A rope can just enclose a square with a side length of 5 cm. If it is encircled into a rectangle, then the length of the rectangle is 8 cm, and what is the width?
一根绳子正好能围成一个边长5厘米的正方形，如果把它围成一长方形，那么长方形的长是8厘米，宽是多少．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<result>2</result>