The auto repair shop used 680 kwh of electricity last month, and this month it saved (1/17) compared with last month. How much kwh did it actually use this month?
汽车修理厂上个月用电680度，这个月比上个月节约(1/17)，这个月实际用电多少度？
<gadget id="calculator">1 / 17</gadget>
<output>1/17 = around 0.058824</output>

<gadget id="calculator">1 - (1/17)</gadget>
<output>16/17 = around 0.941176</output>

<gadget id="calculator">680 * (16/17)</gadget>
<output>640</output>

<result>640</result>