The power consumption in October is less than that in September (1/10), how much is the power consumption in October of September
10月份用电量比9月份节约(1/10)，10月份的用电量是9月份的多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>