It takes 12 minutes to saw a piece of wood into 4 sections. If it is sawn into 5 sections, how many minutes will it take?
一根木料，锯成4段要12分钟，如果锯成5段，要多少分钟分钟．
<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>