There is a pile of coal, originally planned to burn 12.5 tons per day, and burn it out in 32 days. If 2.5 tons of coal is saved every day, how many days can it actually be burned?
有一堆煤，原计划每天烧12.5吨，32天烧完．如果每天节约用煤2.5吨，这样实际能烧几天？
<gadget id="calculator">12.5 * 32</gadget>
<output>400</output>

<gadget id="calculator">12.5 - 2.5</gadget>
<output>10</output>

<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<result>40</result>