The factory pulled back a pile of coal. It was originally planned to burn 800 kilograms per day, which could last for 30 days. Master Li renovated the boiler. The daily coal consumption was 20% less than the original plan. How many days can this pile of coal actually be burned?
工厂里拉回一堆煤，原计划每天烧800千克，能烧30天，李师傅对锅炉进行了更新改造，每天的烧煤量比原计划节约20%，这堆煤实际可以烧多少天？
<gadget id="calculator">800 * 30</gadget>
<output>24_000</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 * (4/5)</gadget>
<output>640</output>

<gadget id="calculator">24_000 / 640</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>