The factory plans to use 1.38 million tons of coal in the first 3 days of 10 days in a certain month, and an average of 288,000 tons per day in the last 7 days. How many tons of coal does the factory use on average every day?
工厂计划用煤，某月10天中前3天共用138万吨，后7天平均每天用28.8万吨．工厂平均每天用煤多少万吨？
<gadget id="calculator">28.8 * 7</gadget>
<output>201.6</output>

<gadget id="calculator">138 + 201.6</gadget>
<output>339.6</output>

<gadget id="calculator">339.6 / 10</gadget>
<output>33.96</output>

<result>33.96</result>