The steel factory transported a batch of coal. It is planned to burn 8 tons per day, which can be burned for 45 days. In fact, it burns 0.8 tons less coal per day. How many days does this batch of coal actually burn? (Solve with ratio)
炼钢厂运进一批煤，计划每天烧8吨，可以烧45天，实际每天少烧煤0.8吨，这批煤实际烧多少天？(用比例解)
<gadget id="calculator">45 * 8</gadget>
<output>360</output>

<gadget id="calculator">8 - 0.8</gadget>
<output>7.2</output>

<gadget id="calculator">360 / 7.2</gadget>
<output>50</output>

<result>50</result>