The school cafeteria shipped 3,000 kilograms of coal. It was originally planned to be burned in 30 days, but the actual saving was 25 kilograms per day compared to the original plan. How many days did the coal actually burn?
学校食堂运来3000千克煤，原计划30天烧完，实际每天比原计划节约25千克，这些煤实际烧了多少天？
<gadget id="calculator">3_000 / 30</gadget>
<output>100</output>

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

<gadget id="calculator">3_000 / 75</gadget>
<output>40</output>

<result>40</result>