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 60, then it will take 31 days to complete; to complete. 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60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60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个．
<gadget id="calculator">3 * 31</gadget>
<output>93</output>

<gadget id="calculator">3 * 25</gadget>
<output>75</output>

<gadget id="calculator">75 - 60 - 60</gadget>
<output>-45</output>

<gadget id="calculator">93 + (-45)</gadget>
<output>48</output>

<gadget id="calculator">31 - 25</gadget>
<output>6</output>

<gadget id="calculator">48 / 6</gadget>
<output>8</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 31</gadget>
<output>155</output>

<gadget id="calculator">155 + 60</gadget>
<output>215</output>

<result>215</result>