A garment factory plans to make 4,500 sets of clothes. It has been done for 4 days, with an average of 125 sets per day. If the remaining 200 sets are made every day, how many days will it take to complete?
某服装厂计划做4500套衣服，已经做了4天，平均每天做125套，剩下的如果每天做200套，还需几天完成？
<gadget id="calculator">125 * 4</gadget>
<output>500</output>

<gadget id="calculator">4_500 - 500</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 / 200</gadget>
<output>20</output>

<result>20</result>