A pile of sand (4/5) is 40 tons, how many tons is this pile of sand?
一堆沙的(4/5)是40吨，这堆沙是多少吨．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / (4/5)</gadget>
<output>50</output>

<result>50</result>