From the diagram, we can see that the combination of angles JKM, MKN, and NKL make a straight angle, that is,
m∠JKM + m∠MKN + m∠NKL = 180°
Substituting with data:
60° + m∠MKN + 35° = 180°
m∠MKN = 180° - 60° - 35°
m∠MKN = 85°
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