The garment factory processed 1,000 sets of children's clothing. It was originally planned to be completed in 40 days, but it was actually completed in 25 days. How much less was the original plan than the actual processing time?
服装厂加工1000套童装，原计划40天完成，实际25天完成，原计划每天比实际每天少加工多少装？
<gadget id="calculator">1_000 / 25</gadget>
<output>40</output>

<gadget id="calculator">1_000 / 40</gadget>
<output>25</output>

<gadget id="calculator">40 - 25</gadget>
<output>15</output>

<result>15</result>