|___|___| timbre Tudor
|___| timbre Dan
|___|..+9..| timbre Matei
81 - 9 = 72
2 + 1 + 1 = 4 (segmente egale)
72 : 4 = 18 (valoarea unui segment)
timbre Tudor = 2 × 18 = 36
timbre Dan = 1 × 18 = 18
timbre Matei = 1 × 18 + 9 = 18 + 9 = 27
verificare:
36 + 18 + 27 = 81