Uncle Zhang’s family has 180 ducks, and the number of chickens is twice that of ducks. How many chickens and ducks are there in total?
张大伯家养了180只鸭，养鸡的只数是鸭的2倍，张大伯家养鸡和鸭一共多少只？
<gadget id="calculator">180 * 2</gadget>
<output>360</output>

<gadget id="calculator">360 + 180</gadget>
<output>540</output>

<result>540</result>