A piece of wood is 4 meters long, and it should be sawed into 5 sections on average. It takes 2 minutes to saw each section, how many minutes will it take to complete the saw.
一根木头长4米，要把它平均锯成5段．每锯下一段需2分钟，锯完一共要花多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>8</result>