Xiaojun and Liu Yu shared 180 tons of water in the first six months of this year. How many tons does each household use on average per month?
小军和刘玉两家今年前6个月一共用水180吨，每户人家平均每个月用水多少吨？
<gadget id="calculator">180 / 6 / 2</gadget>
<output>15</output>

<result>15</result>