For a pile of coal, 24 tons were transported away, which is less than the rest (1/7). How many tons was the pile of coal?
一堆煤，运走24吨，比剩下的少(1/7)，原来这堆煤多少吨．
<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">24 / (6/7)</gadget>
<output>28</output>

<gadget id="calculator">28 + 24</gadget>
<output>52</output>

<result>52</result>