Guangming Water Pump Factory plans to manufacture 1575 pumps in 25 days, but actually produces 12 more pumps per day than the original plan. According to this calculation, how many days can be saved to complete the original production task?
光明水泵厂计划25天制造1575台水泵，实际每天比原计划多生产12台．照这样计算，完成原定生产任务可少用多少天？
<gadget id="calculator">1_575 / 25</gadget>
<output>63</output>

<gadget id="calculator">63 + 12</gadget>
<output>75</output>

<gadget id="calculator">1_575 / 75</gadget>
<output>21</output>

<gadget id="calculator">25 - 21</gadget>
<output>4</output>

<result>4</result>