It takes 4 minutes to cut a stick into three pieces, how many minutes will it take to cut it into 12 pieces?
把一根木棒截成三段要4分钟，如果要截成12段，需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<result>22</result>