Xiaoming’s family used 40.6 tons of water in the first quarter of last year, 33.1 tons in the second quarter, 39.7 tons in the third quarter, and 37.2 tons in the fourth quarter. How many tons did Xiaoming’s house use per month on average last year?
小明家去年第一季度用水40.6吨，第二季度用水33.1吨，第三季度用水39.7吨，第四季度用水37.2吨，小明家去年平均每月用水多少吨？
<gadget id="calculator">40.6 + 33.1 + 39.7 + 37.2</gadget>
<output>150.6</output>

<gadget id="calculator">150.6 / 12</gadget>
<output>12.55</output>

<result>12.55</result>