Steel plants produced an average of 500,000 tons of steel per month in the second quarter of this year, an increase of 100,000 tons of steel per month compared with the first quarter. How many tons of steel were produced on average per month in the first half of this year?
钢铁厂今年第二季度平均每月生产钢50万吨，比第一季度平均每月增产钢10万吨，今年上半年平均每月生产钢多少万吨？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">150 + 120</gadget>
<output>270</output>

<gadget id="calculator">270 / 6</gadget>
<output>45</output>

<result>45</result>