It takes 20 minutes to saw a piece of wood of uniform thickness into 5 sections, how many minutes will it take for each saw.
把一根粗细均匀的木头锯成5段需要20分钟，每锯一次要用多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>5</result>