There are 18 ducks, and the number of chickens is 3 times that of ducks, less than 5. How many chickens are there?
鸭有18只，鸡的只数是鸭的3倍少5只，鸡有多少只？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 - 5</gadget>
<output>49</output>

<result>49</result>