In 6 years, Carla will be 30 years old. The sum of the current ages of Carla and Louis is 55. How old is Louis now?
Carla is currently 30-6=
<gadget id="calculator">30-6</gadget>
<output>24</output>
24 years old.
Louis is 55-24=
<gadget id="calculator">55-24</gadget>
<output>31</output>
31 years old at present.

<result>31</result>