Shaft No. 1 of Baohua Coal Mine mined 351,000 tons of coal last year, 22,000 tons less than twice that of Shaft No. 2. How many tons of coal was mined in Well No. 2 last year? (equation solution)
宝华煤矿一号井去年采煤35.1万吨，比二号井的2倍少2.2万吨．二号井去年采煤多少万吨？(方程解)
<gadget id="calculator">2.2 + 35.1</gadget>
<output>37.3</output>

<gadget id="calculator">37.3 / 2</gadget>
<output>18.65</output>

<result>18.65</result>