The Guangming Plant used 3.05 tons of coal in January, 2.76 tons of coal in February, and 1.08 tons less coal in March than the sum of the previous two months. How many tons of coal was used in March?
光明厂一月份用煤3.05吨，二月份用煤2.76吨，三月份用煤比前两个月总和少1.08吨，三月份用煤多少吨？
<gadget id="calculator">2.76 - 1.08</gadget>
<output>1.68</output>

<gadget id="calculator">3.05 + 1.68</gadget>
<output>4.73</output>

<result>4.73</result>