Notam:
D = timbrele Dianei
R = timbrele Rodicai
D + R = 778 timbre
R + 218 = D - 218 + 160
D = R + 218 + 218 - 160
D = R + 276
D /----------/+276
R /----------/
778 - 276 = 502
502 : 2 = 251 (valoarea unui segment egal)
D = 251 + 276 = 527 timbre (are Diana)
R = 251 timbre ( are Rodica)
Verificam:
251 + 527 = 778
251 + 218 = ( 527 - 218) + 160
469 = 309 + 160
469 = 469 (adevarat)