Transfer 1/5 of the grain stored in warehouse A to warehouse B, then the grains in the two warehouses are equal, the original grain in warehouse B is the amount of warehouse A
把甲仓存粮的(1/5)调入乙仓，则两仓粮食相等，原来乙仓存粮是甲仓的多少
<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>