A piece of wood is 8 meters long, it takes 2 minutes to saw once, how many minutes will it take to saw it into 5 sections
一根木头长8米，锯一次要2分钟，现在锯成5段，要用多少分钟
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>