Xinmin Power Plant transported a batch of coal and planned to burn 2.4 tons per day, which could be finished within 30 days. Due to the rebuilding of the stove, 25% of coal is actually saved every day. How many days can this batch of coal actually be burned?
新民电厂运进一批煤，计划每天烧2.4吨，30天可以烧完．由于改建炉灶，实际每天节约用煤25%，这批煤实际可以烧多少天？
<gadget id="calculator">2.4 * 30</gadget>
<output>72</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2.4 * (1/4)</gadget>
<output>0.6</output>

<gadget id="calculator">2.4 - 0.6</gadget>
<output>1.8</output>

<gadget id="calculator">72 / 1.8</gadget>
<output>40</output>

<result>40</result>