SOLUTION: a + b + c = 180 b = 3a c = 5a a=?

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Question 287249: a + b + c = 180
b = 3a c = 5a a=?
Answer by sharon1948(6) About Me  (Show Source):
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#287249
a + b + c = 180
b = 3a
c = 5a
a=?
Solve
You know the equation, now plug in the values that b & c equal
a+3a+5a=180
Combine like terms
9a=180
Divide by 9 to isolate a
180/9 = 20
Therefore a = 20