Uncle Wang, a professional householder, raises many chickens and ducks, and the number of chickens is 1 (1/4) times the number of ducks. How much is the number of ducks in the total number of chickens and ducks?
专业户王老伯养了许多鸡、鸭，鸡的只数是鸭的只数的1(1/4)倍．鸭的只数占鸡鸭总只数的多少．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>