Xiaoli’s house uses 80kW•h of electricity this month, which is 20kW•h less than last month. How much is the saving compared with last month?
小丽家本月用电80kW•h，比上月节约了20kW•h，比上月节约了多少
<gadget id="calculator">20 + 80</gadget>
<output>100</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>