There is a pile of coal in a certain factory. It was originally planned to burn 0.25 tons per day, but it can be burned for 100 days. Actually, it burns 0.2 tons per day. How many more days will it burn than planned?
某工厂有一堆煤，原计划每天烧0.25吨，可烧100天，实际每天烧0.2吨，这样比计划多烧多少天？
<gadget id="calculator">100 / 0.2</gadget>
<output>500</output>

<gadget id="calculator">0.25 * 500</gadget>
<output>125</output>

<gadget id="calculator">125 - 100</gadget>
<output>25</output>

<result>25</result>