Xiao Ming’s electricity consumption in October was 80 kWh, which was 20 kWh less than that in September. How much was the savings?
小明家10月份用电80千瓦时，比9月份节约20千瓦时，节约了多少
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

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

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