The canteen burned 10 tons of coal in February, saving (1/5) compared to January. How many tons of coal was burned in January? What is the correct column
食堂2月份烧煤10吨，比1月份节约了(1/5)，1月份烧煤多少吨？正确列式是多少
<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">10 / (4/5)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>