The farm needs to harvest 252 hectares of wheat, and 84 hectares were harvested in the first 3 days. Based on this calculation, how many days will it take to harvest the rest? (Solve with ratio)
农场要收割小麦252公顷，前3天收割了84公顷，照这样计算，剩下的还要几天才能收割完？(用比例解)
<gadget id="calculator">252 - 84</gadget>
<output>168</output>

<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">168 / 28</gadget>
<output>6</output>

<result>6</result>