The cafeteria brought 1.08 tons of coal and planned to burn it for 4.5 days, but actually saved 0.06 tons per day. How many days did the coal actually burn?
食堂运来1.08吨煤，计划烧4.5天，实际每天节约0.06吨，这些煤实际烧了几天？
<gadget id="calculator">1.08 / 4.5</gadget>
<output>0.24</output>

<gadget id="calculator">0.24 - 0.06</gadget>
<output>0.18</output>

<gadget id="calculator">1.08 / 0.18</gadget>
<output>6</output>

<result>6</result>