Processing a batch of parts was originally planned to be finished in 15 days. If 300 pieces are made every day, it will be finished 3 days in advance, so how many pieces should be made every day?
加工一批零件，原计划15天做完，如果每天做300个，则提前3天做完，则原来每天做多少个．
<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">12 / 15</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">300 * (4/5)</gadget>
<output>240</output>

<result>240</result>