Starting with the 120° angle, relative to that, we have
... I is vertical so equal, 120°
... J, K are linear angles, so supplementary, 60°
... Q is same-side internal, so supplementary, 60°
... P is alternate internal, so equal, 120°.
Starting with the 40° angle, relative to that, we have
... M is vertical, so equal, 40°
... N, O are linear angles, so supplementary, 140°
... G is corresponding, so equal, 40°
... E is alternate external, so equal, 40°
... F is same-side external, so supplementary, 140°
H is an external angle to the triangle LMQ. Angles M and Q are opposite internal angles, so H is their sum, 40° +60° = 100°. (H is also opposite internal angles G and K, which have the same sum.)
L is a linear angle with H, so supplementary, 80°.
In summary,
... E 40°, F 140°, G 40°, H 100°, I 120°, J 60°, K 60°, L 80°, M 40°, N 140°, O 140°, P 120°, Q 60°