Answer: 22
Explanation:
Given : Before a show, there are 8 people in a theater. Five groups of 4 people enter, and then three groups of 2 people leave.
The expression to find how many people are in the theater is given as :

Using BODMAS (Bracket , Of , Divide , Multiplication, Add, Subtract), we first open brackets .

Now again using BODMAS , first we solve addition operation, then subtraction.

Hence, the number of people are in the theater= 22