There is a pile of coal, and it is planned to burn 3.6 tons per day, which can be burned for 35 days. If 0.6 tons are saved every day, how many days can it be burned?
有一堆煤，计划每天烧3.6吨，可以烧35天，如果每天节约0.6吨，可以烧多少天？
<gadget id="calculator">3.6 * 35</gadget>
<output>126</output>

<gadget id="calculator">3.6 - 0.6</gadget>
<output>3</output>

<gadget id="calculator">126 / 3</gadget>
<output>42</output>

<result>42</result>