The problem asks to determine the number of students among 80 people who attended a cinema. A student's ticket costs 30 DH, and a normal ticket costs 45 DH. The total revenue for 80 people is 3225 DH.

1. Problem Description

The problem asks to determine the number of students among 80 people who attended a cinema. A student's ticket costs 30 DH, and a normal ticket costs 45 DH. The total revenue for 80 people is 3225 DH.

2. Solution Steps

Let $x$ be the number of students. Then the number of non-students is $80 - x$.

The total revenue from students is $30x$ DH, and the total revenue from non-students is $45(80 - x)$ DH.

The total revenue is given as 3225 DH.

So we can write the equation:

$30x + 45(80 - x) = 3225$

$30x + 3600 - 45x = 3225$

$-15x = 3225 - 3600$

$-15x = -375$

$x = \frac{-375}{-15}$

$x = 25$

Therefore, the number of students is

2

5.

3. Final Answer

There were 25 students.