A factory produces a batch of parts. If it produces 3 fewer parts per day than the original plan, and the production quota of parts is reduced by 30, it will take 31 days to complete. It can be completed, then what is the original planned parts production quota.
某工厂生产一批零件，如果每天比原计划少生产3个，同时零件生产定额减少30个，那么需要31天完成，如果每天超额生产3个，并且零件生产定额增加30个，那么经过25天即可完成，则原计划的零件生产定额是多少．
<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<gadget id="calculator">28 - 3</gadget>
<output>25</output>

<gadget id="calculator">25 * 31</gadget>
<output>775</output>

<gadget id="calculator">775 + 30</gadget>
<output>805</output>

<result>805</result>