Fangfang’s family used 14.8 tons of water in April, which is 1.6 tons less than last month. How many tons did Fangfang’s family use last month?
芳芳家四月份用水14.8吨，比上个月节约了1.6吨，芳芳家上个月用水多少吨？
<gadget id="calculator">14.8 + 1.6</gadget>
<output>16.4</output>

<result>16.4</result>