The school newly ordered 1,450 desks, 640 of which have been completed, and the remaining tasks must be completed within 30 days. How many desks are to be done on average per day?
学校新订制1450张课桌，已经完成了640张，剩下的任务必须30天内完成，平均每天要做多少张？
<gadget id="calculator">1_450 - 640</gadget>
<output>810</output>

<gadget id="calculator">810 / 30</gadget>
<output>27</output>

<result>27</result>