The price of tap water for residents in a certain city is 2.5 yuan per ton. Xiaoming's family paid 22 yuan for water last month. How many tons did his family use last month? (solution by equation)
某市居民用自来水的价格为每吨2.5元．小明家上个月付水费22元，他家上个月用水多少吨？(用方程解)
<gadget id="calculator">22 / 2.5</gadget>
<output>8.8</output>

<result>8.8</result>