A bamboo pole is 12 meters long, and it is cut into 2-meter-long pieces. Each cut takes 3 minutes. How many minutes does it take in total?
一根竹竿长12米，截成每段长2米的小段，每截一次需要3分钟，一共需要多少分钟．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>