a + a = b + b, a + c + b + c = 80, b + b + b = c + c + c, a =?, b =?, c =?

a + a = b + b, a + c + b + c = 80, b + b + b = c + c + c, a =?, b =?, c =?


a = 30 b = 20 c = 15



a + b + c = 80, a: b: c, 즉 a = (), b = (), c= ()
a + b + c = 80, a: b: c = 5: 7: 4, 즉 a = (), b = (), c= ()


25 35 20