## Algebra 2 (1st Edition)

$2400$.
Using the formula from the example, if the number of new movies bought is $n_1$ and the number of old movies bought is $n_2$, then $n_1=\frac{12000-3n_2}{5}$. Hence here $n_1=\frac{12000-3(0)}{5}=\frac{12000-0}{5}=\frac{12000}{5}=2400$.