Great Wall Electric Fan Factory planned to produce 2080 electric fans in May, and produced 640 electric fans in the first 8 days. According to this calculation, how many days can it be completed in advance? (Solve with ratio)
长城电扇厂五月份计划生产电扇2080台，前8天生产了640台．照这样计算，可以提前几天完成？(用比例解)
<gadget id="calculator">2_080 - 640</gadget>
<output>1_440</output>

<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<gadget id="calculator">1_440 / 80</gadget>
<output>18</output>

<gadget id="calculator">18 + 8</gadget>
<output>26</output>

<gadget id="calculator">31 - 26</gadget>
<output>5</output>

<result>5</result>