a + b + c = 153
a = b + 10
c : ( a + b ) = 3 rest 17
c = 3 × ( a + b ) + 17
c = 3 × a + 3 × b + 17
a + b + c = 153
b + 10 + b + 3 × ( b + 10 ) + 3 × b + 17 = 153
8 × b = 153 - 17 - 30 - 10
8 × b = 96
b = 96 : 8
b = 12
a = 12 + 10 = 22
c = 3 × 12 + 3 × 22 + 17 = 36 + 66 + 17 = 119
Verific: 12 + 22 + 119 = 153 → suma celor trei numere
