It takes 12 minutes to divide a steel pipe into 4 sections. According to this calculation, how many minutes will it take to divide it into 5 sections.
把一根钢管据成4段要12分钟，照这样计算，据成5段需要多少分钟．
<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>