The farm needs to harvest 1,300 hectares of wheat. It was originally planned to harvest 60 hectares per day. After 5 days of harvesting, it will be changed to 50 hectares per day. How many days will it take to complete?
农场要收割1300公顷小麦，原计划每天收割60公顷，收割5天后改为每天收割50公顷，还需要多少天才能完成？
<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">1_300 - 300</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<result>20</result>