A piece of wood is 12 meters long. If you want to saw it into 6 sections, it will take 4 minutes to cut each section. How many minutes will it take to complete the sawing?
一根木料长12米，要把它锯成6段，每锯下一段需要4分钟，锯完一共要花多少分钟．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<result>20</result>