The price of tap water used by residents in a certain city is 2.5 yuan per ton. Xiao Ming’s family paid 20 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20元，他家上个月用水多少吨？(用方程解)
<gadget id="calculator">20 / 2.5</gadget>
<output>8</output>

<result>8</result>