If the number of chickens is 1/4 of that of ducks, then how much less are the number of chickens than ducks?
鸡的只数是鸭的(1/4)，则鸡的只数比鸭少多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>