The number of goats is less than the number of sheep (1/5), and the number of goats is equal to the number of sheep.
山羊的只数比绵羊的只数少(1/5)，山羊的只数是绵羊只数的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>