A garment factory plans to make 660 sets of clothes, and has been doing it for 5 days, with an average of 75 sets per day. The rest will take 5 days to finish, how many sets are done on average per day?
一个服装厂计划做660套衣服，已经做了5天，平均每天做75套．剩下的要5天做完，平均每天做多少套？
<gadget id="calculator">5 * 75</gadget>
<output>375</output>

<gadget id="calculator">660 - 375</gadget>
<output>285</output>

<gadget id="calculator">285 / 5</gadget>
<output>57</output>

<result>57</result>