It takes 12 minutes to saw a piece of wood into 3 sections on average. If it is sawed into 5 sections, how many minutes will it take?
把一根木料平均锯成3段，需要12分钟，如果锯成5段，需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

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

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>