Given:
The total students in the bus initially, T=50.
15 students got off the bus at the first stop and 8 students got off at the second bus stop.
Now, the students left in the bus is
[tex]\begin{gathered} N=T-15-8 \\ N=50-15-8 \\ N=27 \end{gathered}[/tex]Therefore, 27 students are left in the bus.