68o
72o
112o
124o
Correct answer is D
In Δ XYZ, 2m + 2n + 68o = 180o
2(m + n) + 68o = 180o...(1)
in Δ XOZ, m + n + q = 180o ...(2)
(m + n) = 180o - q...(3)
substituting 180o - q for (m + n) in (1) gives
2(180o - q) + 68o = 180o
360o - 2q = 180o - 68o
360o - 2q = 112o
360o - 112o = 2q
248o = 2q
q = 248o2
= 124o
hence, < XOZ = 124o