A pile of coal, originally planned to burn 1,000 kilograms per day, can be burned for 30 days. Due to improved technology, it can burn 25 kilograms per day. How many days can it actually burn? (Solve with ratio)
一堆煤，原计划每天烧1000千克，能烧30天，由于改进技术，每天烧25千克，实际能烧几天？(用比例解)
<gadget id="calculator">1_000 * 30</gadget>
<output>30_000</output>

<gadget id="calculator">30_000 / 25</gadget>
<output>1_200</output>

<result>1_200</result>