Answer:
b = 31
Step-by-step explanation:
The sum of angles in a triangle is 180 degrees, so you have ...
(b +16) +(b +8) +3b = 180
5b +25 = 180 . . . . simplify
b +5 = 36 . . . . . . . divide by 5
b = 31 . . . . . . . . . . subtract 5
The value of b is 31.