The electricity consumption of the school in February was 420 kWh, which was 35 kWh less than that in January. How much was the saving? What is the column
学校二月份用电420千瓦时，比一月份节约了35千瓦时，节约了几分之几？列式是多少
<gadget id="calculator">420 + 35</gadget>
<output>455</output>

<gadget id="calculator">35 / 455</gadget>
<output>1/13 = around 0.076923</output>

<result>1/13 = around 0.076923</result>