In a subtraction problem, the subtrahend is (4/5) of the minuend, so what percentage of the minuend is the difference?
在一道减法题中，减数是被减数的(4/5)，则差是被减数的百分之几？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

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

<result>1/5 = around 0.2</result>