Additional question: There are 17 ducks in the river, 2 more than 5 times the number of geese. How many geese are there?
附加题：河里有鸭17只，比鹅的5倍还多2只，鹅有多少只？
<gadget id="calculator">17 - 2</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<result>3</result>