Answer:
n = 5
Step-by-step explanation:
[tex] \because m \angle \: 3 + m \angle \: 4 = 180 \degree..(supplementary \: \angle s) \\ \therefore \: 9n + 24n + 15 = 180 \\ \therefore \: 33n = 180 - 15 \\ \therefore \: 33n = 165 \\ n = \frac{165}{33} \\ \huge \red{ \boxed{\therefore \: n = 5}}[/tex]
