Answer:
hai
a triangle's sum of interior angels is equal to 180°.
so we have this equailty
y+10°+50+2y = 180
3y+60° = 180.
to solve better, im throwing 60 near 180. 60° is going to be -60 cause of it.
3y=180-60 = 3y=120
now im dividing both 3. because both can divide by 3.
3y/3 = 120/3 = y=40
good luck(: