What is the answer to a plus b plus c equals 180 b equals 3a c equals 5a?

a + b + c = 180

b = 3a

c = 5a

Substituting the values of b and c into the first equation.

a + 3a + 5a = 180 or 9a = 180 so that a = 20

then b = 3a = 3*20 = 60

and c = 5a = 5*20 = 100