The number of chickens in the farm is the number of ducks (4/5), so the number of ducks is the number of chickens
养殖场鸡的数量是鸭的(4/5)，那么鸭的数量是鸡的多少
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / (4/5)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>