Final answer:
The theater sold 51 adult tickets last night.
Step-by-step explanation:
To find the number of adult tickets sold last night, we need to count the number of values in the given list that are greater than or equal to 200, since adult tickets are usually priced higher. Looking at the list, we can see that there are 51 values that meet this criteria. Therefore, the theater sold 51 adult tickets last night.