The machine tool factory actually burns 240 tons of coal per month, which is 20% less than the original plan. How many tons of coal was originally planned to be burned per month? (answer in two ways)
机床厂实际每月烧煤240吨，比原比划节约20%，原计划每月烧煤多少吨？(用两种方法解答)
<gadget id="calculator">20 / 100</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">240 / (4/5)</gadget>
<output>300</output>

<result>300</result>