A batch of coal was shipped from the school cafeteria. It is planned to burn 0.25 tons per day, which can be burned for 80 days. The actual saving is 0.05 tons per day. How many days can this batch of coal actually be burned?
学校食堂运来一批煤，计划每天烧0.25吨，可以烧80天，实际每天节约0.05吨，这批煤实际可以烧多少天？
<gadget id="calculator">0.25 - 0.05</gadget>
<output>0.2</output>

<gadget id="calculator">80 / 0.2</gadget>
<output>400</output>

<gadget id="calculator">0.25 * 400</gadget>
<output>100</output>

<result>100</result>