PLEASE ANSWER I WILL GIVE BRAINLIEST!! (trolls get banned)

Answer:
LMK is 30
Step-by-step explanation:
inside the triangle, the LMN is the equation 3x=90degrees
under the KN is 4x
on the left is 150dgrees = 5x
3x+4x+5x=360
add the x's together
12x=360
divide
x=30
LMK= 150-90/2=60/2=30