A chemical plant burns 140 tons of coal in May, which is (1/5) less than the original plan. How many tons of coal was originally planned to be burned in May? (solution with equation)
一个化工厂五月份烧煤140吨，比原计划节约了(1/5)．五月份原计划烧煤多少吨．(用方程解答)
<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">140 / (4/5)</gadget>
<output>175</output>

<result>175</result>