The cafeteria shipped back a batch of coal, burned 8.5 tons in the first month, burned 1.8 tons more in the second month, and left 6.2 tons. How many tons of coal are there in total?
食堂运回一批煤，第一个月烧去8.5吨，第二个月多烧1.8吨，还剩下6.2吨．这批煤共有多少吨？
<gadget id="calculator">8.5 + 1.8</gadget>
<output>10.3</output>

<gadget id="calculator">8.5 + 10.3 + 6.2</gadget>
<output>25</output>

<result>25</result>