The price of water used by a certain citizen is 2.2 yuan/ton, and Grandma Zhang’s family paid a total of 39.6 yuan for water in November and December. Given that the water consumption in November is 8.8 tons, find the water consumption of Grandma Zhang’s house in December.
某市民用水的价格是2.2元/吨，张奶奶家十一、十二两个月一共缴纳水费39.6元．已知十一月份的用水量是8.8吨，求张奶奶家十二月份的用水量．
<gadget id="calculator">39.6 / 2.2</gadget>
<output>18</output>

<gadget id="calculator">18 - 8.8</gadget>
<output>9.2</output>

<result>9.2</result>