Answer:
x = 50
Step-by-step explanation:
The sum of the angles of a quadrilateral are 360
M + N + J + K = 260
x + x+15 + 2x+15 + 3x-20 = 360
Combine like terms
7x + 10 = 360
Subtract 10 from each side
7x+10-10 = 360-10
7x= 350
Divide each side by 7
7x/7 = 350/7
x = 50
