Xiao Ming’s family used 14.8 tons of water in October last year, 12.4 tons in November, and 12.1 tons in December. How many tons of water does Xiao Ming’s house use per month on average this quarter?
小明家去年10月份用水14.8吨，11月份用水12.4吨，12月份用水12.1吨，这个季度小明家平均每个月用水多少吨？
<gadget id="calculator">14.8 + 12.4 + 12.1</gadget>
<output>39.3</output>

<gadget id="calculator">39.3 / 3</gadget>
<output>13.1</output>

<result>13.1</result>