Answer:
After 6 months, they watched 144 movies.
Explanation:
Givens
- Mark has been watching 16 movies per month.
- Max has been watching half movies than Mark per month.
- They have seen 144 movies.
We can represent the number of movies Mark has been watching per month as

The representation for Max is

Now, we know that they watched 144 movies in
months, so

Then, we solve for


Therefore, after 6 months, they watched 144 movies.