A pile of coal has 144 tons. It was originally planned to burn for 72 days. Thanks to improved technology, 0.8 tons can be saved every day. How many more days can this pile of coal be burned? (Solve with ratio)
一堆煤有144吨，原计划可以烧72天，由于改进技术，每天节约0.8吨，这堆煤可以多烧多少天？(用比例解)
<gadget id="calculator">144 / 72</gadget>
<output>2</output>

<gadget id="calculator">2 - 0.8</gadget>
<output>1.2</output>

<gadget id="calculator">144 / 1.2</gadget>
<output>120</output>

<gadget id="calculator">120 - 72</gadget>
<output>48</output>

<result>48</result>