In October, Xiaoming's house used 60 kwh of electricity, which was 20 kwh less than last month. How much was the saving compared with last month?
小明家10月份用电60千瓦时，比上月节约了20千瓦时，比上月节约了多少
<gadget id="calculator">60 + 20</gadget>
<output>80</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>