pile of coal was originally planned to burn 65 kilograms per day, which can be burned for 80 days. After improving the technology, the actual burning is reduced by 25 kilograms per day. How many days did it actually burn?
一堆煤原计划每天烧65千克，可以烧80天．改进技术后实际每天少烧25千克，实际烧了多少天？
<gadget id="calculator">65 - 25</gadget>
<output>40</output>

<gadget id="calculator">80 / 40</gadget>
<output>2</output>

<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<result>130</result>