There are 15 chickens, 5 more than ducks. There are 8 more geese than ducks. Find the number of geese. What is the correct column formula?
有鸡15只，比鸭多5只．鹅比鸭多8只，求鹅的只数，正确的列式是多少
<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<result>18</result>