Answer:
80
Step-by-step explanation:
60+40+b=180
100+b=180
b=180-100
= 80
As noted in the problem, a + b + c = 180
We know that a = 60 and c = 40
If we plug our values into the equation.
60 + b + 40 = 180. Simplify the left side of the equation.
100 + b = 180. Subtract 100 from each side.
b = 80
