A + G + D = 348 castane
G = 2 × A
G = D - 13 ==> D = G + 13
A /----/
G /----/----/
D /----/----/+13
348 -13 = 335
335 : 5 = 67 (un segment egal)
A = 67 castane (Alina)
G = 2×67 = 134 castane (George)
D = 2×67+13 = 147 castane (Diana)
verificare
67 + 134 + 147 = 348