There are 58 roosters and 44 hens in the farm. The number of ducks is twice that of chickens, how many ducks.
养殖场有公鸡58只，母鸡44只．鸭子的只数是鸡的2倍，鸭子多少只．
<gadget id="calculator">58 + 44</gadget>
<output>102</output>

<gadget id="calculator">102 * 2</gadget>
<output>204</output>

<result>204</result>