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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
y + z = 180°
z = 180° - y
x + k = 180°
k = 180° - x
The sum of angles in the \(\bigtriangleup\) are: n + z + k = 180°
but n + 180° - y + 180° - x = 180°
n + 180° - y - x = 0
But we want to find n
n + 180° = x + y
But x + y = 220°
n + 180° = 220°
n = 220° - 180°
n = 40°