After a pile of coal is partly removed, there are still (2/5) tons left, which happens to be (2/5) removed. How many tons were shipped?
一堆煤运走一部分后还剩下(2/5)吨，正好是运走的(2/5)．运走了多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / (2/5)</gadget>
<output>1</output>

<result>1</result>