To dig a canal 360 meters long, 20 farmers dug 90 meters in 6 days. At this speed, how many days will it take them to complete the task? (Solution with proportional knowledge)
挖一条长360米的水渠，20个农民6天挖了90米．照这样的速度，他们完成任务共需要几天？(用比例知识解)
<gadget id="calculator">6 / 90</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">360 * (1/15)</gadget>
<output>24</output>

<result>24</result>