In Parallelogram PARK,
angle P = (7x) degree
angle A = (3x - 20) degree
angle K = (5y - 10) degree.
What is x + y?
(x+y)+7x+(3x-20)+(5y-10) = 360o.
The opposite angles are equal:
R = (x+y) = P = 7x. K = (5y-10) = A = (3x-20).
(7x)+(7x)+(3x-20)+(3x-20) = 360,
20x = 400, X = 20.
x+y = 7x = 7*20 = 140o.