A worker processes a batch of shoes, 80 pairs per day, which can be completed in 6 days. If 120 pairs are processed every day, how many days will it take to complete the processing task? (Solve with ratio)
一位工人加工一批鞋子，每天加工80双，6天可以完成．如果每天加工120双，几天就完成加工任务？(用比例解)
<gadget id="calculator">80 * 6</gadget>
<output>480</output>

<gadget id="calculator">480 / 120</gadget>
<output>4</output>

<result>4</result>