There is a piece of wood that needs to be sawn into 5 pieces. It takes 5 minutes to saw each part, how many minutes will it take to saw all the parts.
有一根木头，要锯成5段．每锯开一处需要5分钟，全部锯完一共要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>20</result>