The school lunch group bought back 2.8 tons of coal and planned to burn it for 70 days, but actually burned 0.005 tons less than planned every day. How many days did this batch of coal actually burn?
学校伙食团买回2.8吨煤，计划烧70天，实际每天比计划少烧0.005吨，这批煤实际烧了多少天？
<gadget id="calculator">2.8 / 70</gadget>
<output>0.04</output>

<gadget id="calculator">0.04 - 0.005</gadget>
<output>0.035</output>

<gadget id="calculator">2.8 / 0.035</gadget>
<output>80</output>

<result>80</result>