The steel mill originally planned to use 720 kwh of electricity in August, but it actually saved (1/8) less than the original plan. How much kwh did it actually use?
钢厂八月份原计划用电720度，实际比原计划节约(1/8)，实际用电多少度？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">720 * (7/8)</gadget>
<output>630</output>

<result>630</result>