Transport (1/5) the grain from warehouse A to warehouse B, then the grain from warehouse A is just equal to the grain from warehouse B. How much is the grain from warehouse B equal to that from warehouse A
把甲仓粮食运(1/5)到乙仓，那么甲仓粮食刚好与乙仓粮食相等，原来乙仓粮食是甲仓的多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>