The price of tap water for residents in a certain city is 1.7 yuan per ton. Xiaojun's family paid 35.7 yuan for water last month. How many tons did his family use last month? (column equation solution)
某市居民用自来水的价格为每吨1.7元．小军家上个月付水费35.7元，他家上个月用水多少吨？(列方程解答)
<gadget id="calculator">35.7 / 1.7</gadget>
<output>21</output>

<result>21</result>