Guangwai Primary School used 20,000 kWh of electricity in November, saving 5,000 kWh compared to October. How much was the saving?
广外小学11月份用电20000千瓦时，比10月份节约了5000千瓦时，节约了百分之几？
<gadget id="calculator">20_000 + 5_000</gadget>
<output>25_000</output>

<gadget id="calculator">5_000 / 25_000</gadget>
<output>1/5 = around 0.2</output>

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