I-------I v arsta fiica
I-------I-------I-------I-------I varsta mamei
I-------I-------I-------I-------I-------I varsta tata
in total 5+4+1=10segmente
60/10=6 repr un segment adica fata are 6 ani
mama are 4*6=24 ani
tata are 5*6=30 de ani
proba 30+24+6=60(ani)