The thermal power plant used 240 tons of coal last month, which is 120 tons less than this month. How many tons of coal are used in two months?
热电厂上个月用煤240吨，比这个月少120吨，两个月共用煤多少吨．
<gadget id="calculator">240 + 120 + 240</gadget>
<output>600</output>

<result>600</result>