a + b + c = 2450 a = b + 250 a = c + 180 c = a - 180 b + 250 + b + a - 180 = 2450 b + 250 + b + b + 250 - 180 = 2450 3b = 2450 - 250 - 250 + 180 3b = 2130 b = 2130 : 3 b = 710 a = b +250 a = 710 + 250 a = 960 c = a - 180 c = 960 - 180 c = 780 verificam 960 + 710 + 780 = 2450