Answer
The number of movies are $20$.
Work Step by Step
The given equation is
$\Rightarrow 1.5r+15=2.25r$
Subtract $1.5r$ from each side.
$\Rightarrow 1.5r+15-1.5r=2.25r-1.5r$
Simplify.
$\Rightarrow 15=0.75r $
Divide each side by $0.75$.
$\Rightarrow \frac{15}{0.75}=\frac{0.75r}{0.75} $
Simplify.
$\Rightarrow 20=r $
Hence, the number of movies are $20$.
