There is a batch of coal in Changzhou Power Plant. It was originally planned to burn 5 tons per day, which can be burned for 60 days. The actual saving is 20% per day. How many days can this batch of coal actually be burned? (Solve with ratio)
长州电厂有一批煤，原计划每天烧5吨，可以烧60天，实际每天节约20%，这批煤实际可以烧多少天？(用比例解)
<gadget id="calculator">5 * 60</gadget>
<output>300</output>

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

<gadget id="calculator">5 * (1/5)</gadget>
<output>1</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<result>75</result>