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