A carpentry team needs to make 1450 desks. 640 pieces have been made, and the rest will take 30 days to finish. How many sheets do you make on average per day?
一个木工组要做1450张课桌．已经做了640张，剩下的要用30天做完．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>