A piece of wood is 20 meters long. If you want to saw it into 5 sections on average, it will take 8 minutes to cut each section. How many minutes will it take to complete the sawing?
一根木头长20米，要把它平均锯成5段，每锯下一段需要8分钟，锯完一共需要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<result>32</result>