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? Think carefully first, then make a decision:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Carla is currently 30 - 6 = 24 years old. Louis is 55 - 24 = 31 years old at present. So, the answer is 31.