Transfer (1/5) of the grain in warehouse A to warehouse B, and the two warehouses have the same amount of grain. How much less grain is stored in warehouse B than in warehouse A?
把甲仓粮食的(1/5)调入乙仓，两仓存粮相等，原来乙仓存粮数比甲仓少多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>