A pile of coal is 21,600 tons. A certain factory plans to burn it in 12 days, but actually burns 360 tons more than the original plan every day. How many days did the factory actually burn this pile of coal?
一堆煤21600吨，某工厂计划12天烧完，实际每天比原计划多烧360吨，这堆煤这个工厂实际烧了多少天？
<gadget id="calculator">21_600 / 12</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 + 360</gadget>
<output>2_160</output>

<gadget id="calculator">21_600 / 2_160</gadget>
<output>10</output>

<result>10</result>