I used substitution to get to this, but not fully sure if this is correct (solve quadratic)
Answer:
73:42
Step-by-step explanation:
1115-73=42
G : B
73 : 42
A+b=13
a-b=7
add the two equations using system of equations
2a=20
a=10
10+b=13
b=3
You can see if their angles are equal to each other