To build a 216-meter-long canal, it is planned to be completed by 6 people in 12 days. At this rate, if the number of people triples, how many days will it take to complete the repair?
修一条长216米的水渠，计划6人12天修完．照这样的速度，如果人数增加到原来的3倍，几天能够修完？
<gadget id="calculator">216 / 6 / 12</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">3 * 18</gadget>
<output>54</output>

<gadget id="calculator">216 / 54</gadget>
<output>4</output>

<result>4</result>