woodworking factory needs to process 1450 desks for schools. 640 sheets have been processed, and the remaining ones are processed on average 30 sheets per day. How many days can it be processed? (column equation solution)
一个木器加工厂要给学校加工1450张课桌．已经加工了640张，剩下的平均每天加工30张，多少天能加工完？(列方程解答)
<gadget id="calculator">1_450 - 640</gadget>
<output>810</output>

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

<result>27</result>