Master Li originally planned to produce 75 parts per day, which was completed in 20 days. In fact, 25 more parts were produced per day. How many days were actually taken less than the original plan?
李师傅原计划每天生产75个零件，20天完成，实际每天多生产25个，实际比原计划少用多少天？
<gadget id="calculator">75 * 20</gadget>
<output>1_500</output>

<gadget id="calculator">75 + 25</gadget>
<output>100</output>

<gadget id="calculator">1_500 / 100</gadget>
<output>15</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>