It takes 20 minutes to saw a piece of wood into 5 sections. How many minutes does each sawing take?
把一根木头锯成5段，共用20钟，每锯一次要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>