The garment factory needs to produce 500 sets of children's clothing, 140 sets have been produced, and the rest will be completed in 4 days. How many sets are produced on average per day?
服装厂要生产500套儿童服装，已经生产了140套，剩下的要4天完成，平均每天生产多少套？
<gadget id="calculator">500 - 140</gadget>
<output>360</output>

<gadget id="calculator">360 / 4</gadget>
<output>90</output>

<result>90</result>