Răspuns :
a + b + c =257
a = 15 + b
c = 17 + b
15 + b + b + 17 + b =257
3b + 32 = 257
3b = 225
b = 75
a=75 + 15 = 90
c=75 + 17 = 92
V: 75 + 90 + 92 = 257
a = 15 + b
c = 17 + b
15 + b + b + 17 + b =257
3b + 32 = 257
3b = 225
b = 75
a=75 + 15 = 90
c=75 + 17 = 92
V: 75 + 90 + 92 = 257