The factory used 480 tons of coal in September, saving (1/5) compared to August. How many tons of coal was used in August?
工厂九月份用煤480吨，比八月份节约了(1/5)，八月份用煤多少吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">480 / (4/5)</gadget>
<output>600</output>

<result>600</result>