It takes 4 minutes to saw a piece of wood into 5 sections, and how many minutes it takes.
把一根木料锯成5段，每锯一次需4分钟，共用多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>