A batch of coal was brought from the cafeteria, and it is planned to burn 1.2 tons per day, which can last for 30 days. The actual saving is 0.3 tons per day. How many days can this pile of coal actually be burned?
食堂运来一批煤，计划每天烧1.2吨，可以烧30天．实际每天节约0.3吨，这堆煤实际可以烧多少天？
<gadget id="calculator">1.2 * 30</gadget>
<output>36</output>

<gadget id="calculator">1.2 - 0.3</gadget>
<output>0.9</output>

<gadget id="calculator">36 / 0.9</gadget>
<output>40</output>

<result>40</result>