There are 18 ducks, and the number of chickens is 4 less than three times that of ducks. How many chickens are there?
鸭有18只，鸡的只数比鸭的3倍少4只，鸡有多少只？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 - 4</gadget>
<output>50</output>

<result>50</result>