Sew 16 cm lace around a rectangular white cloth, the length of the lace is 5 cm, and how many cm is the width?
在一个长方形白布的四周缝16厘米的花边，花边长是5厘米，宽是多少厘米？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>