It takes 12 minutes to saw a piece of wood into 4 sections. According to this calculation, how many minutes will it take to saw it into 5 sections?
把一根木材锯成4段要用12分钟，照这样计算，锯成5段要用多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>