Answer:
21.6
Step-by-step explanation:
Using the Sum of Angles property,
2(y + 30) + 3y + 12 = 180
2y + 60 + 3y + 12 = 180
5y = 180 - 72
5y = 108
y = 108/5 = 21.6
BRAINLIEST.
YEP.
