company has a pile of coal. It was originally planned to burn 12 tons per day for 45 days. The actual daily coal consumption is 25% lower than the original plan. How many days does it actually burn? (Solve with ratio)
某公司有一堆煤，原计划每天烧12吨可以烧45天，实际每天烧煤比原计划节约25%这堆煤，实际烧多少天？(用比例解)
<result>40</result>