A pile of 40 tons of coal has been used up (5/8), how many tons have been used, and the total amount left is ((())/(())).
一堆煤40吨，用去了(5/8)，用去了多少吨，还剩总数的((())/(()))．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">40 * (5/8)</gadget>
<output>25</output>

<result>25</result>