There is a batch of coal in a factory. The original plan is to burn 0.25 tons per day, which can last for 100 days. The actual daily coal consumption is 20% lower than the original plan. How many days can it actually burn?
某工厂有一批煤，原计划每天烧0.25吨，可烧100天，实际每天燃煤比原计划节约20%，实际可以烧多少天？
<gadget id="calculator">0.25 * 100</gadget>
<output>25</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">0.25 * (4/5)</gadget>
<output>0.2</output>

<gadget id="calculator">25 / 0.2</gadget>
<output>125</output>

<result>125</result>