The factory plans to produce a batch of watches, and plans to produce 300 watches per day, which will be completed in 20 days, but actually produces 450 watches per day. How many days will it take to complete the task? (Please use the knowledge of proportion to answer)
工厂计划生产一批手表，计划每天生产300只，20天完成，实际上每天生产450只．多少天才能完成任务？(请用比例的知识解答)
<gadget id="calculator">300 * 20</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 / 450</gadget>
<output>40/3 = around 13.333333</output>

<result>40/3 = around 13.333333</result>