Limin Power Generation used 24,000 tons of coal in July, saving (1/7) compared to June. How many tons of coal was used in June?
利民发电发七月份用煤2.4万吨，比六月份节约了(1/7)，六月份用煤多少万吨？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2.4 / (6/7)</gadget>
<output>2.8</output>

<result>2.8</result>