t = tata, f = Tudor
t - 8 = 8 × ( f - 8) ⇒ t = 8 f - 64 + 8 ⇒ t = 8 f - 56
t + 2 = 3 × ( f + 2) ⇒ t = 3 × f + 6 - 2
8 f - 56 = 3 f + 4
8 f - 3 f = 4 + 56
5 f = 60
f = 60 : 5
f = 12 ani are Tudor
t = 3 x 12 + 4 = 40 ani are tata
Verific: 40 - 8 = 8 × 4 = 32