Teacher Liu’s family used 20 tons of water in July, 6 tons more than last month. How much was saved last month compared to this month?
刘老师家七月份用水20吨，比上月多用6吨，上个月比这个月节约了多少．
<gadget id="calculator">6 / 20</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>