The subtrahend is (4/5) of the minuend, and the difference is the number of the subtrahend.
减数是被减数的(4/5)，差是减数的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>