Answer:
340 total people (see below)
Explanation:
So first, you need to find the number of children. To do that, the percentage of adults must be 55% because is 45% of 100% are children, the remaining are adults. You can use a ratio to find the amount of children:
x children = 45%
187 adults 55%
Now, cross multiply:
55x = 187 (45)
55x = 8415
x = 8415/55
x = 153
There are 153 children.
To find the total amount of people in the theater, add the two amounts:
187 adults + 153 children = ? people
= 340 people