The garment factory plans to produce 1,640 sets of garments. It has been produced for 18 days, and there are 200 sets left to be produced. How many sets of garments are produced on average per day?
服装厂计划生产1640套服装，已经生产了18天，还剩200套没有生产，平均每天生产多少套服装？
<gadget id="calculator">1_640 - 200</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 / 18</gadget>
<output>80</output>

<result>80</result>