Since December 22, 2009, the price of tap water for residents in Beijing is 4 yuan per cubic meter. Qiqi’s family paid 22.4 yuan for water last month. How much cubic meter did his family use last month? (solution by equation)
北京市从2009年12月22日起居民家用自来水的价格为4元/立方米，奇奇家上个月付水费22.4元，他家上个月用水多少立方米？(用方程解)
<gadget id="calculator">22.4 / 4</gadget>
<output>5.6</output>

<result>5.6</result>