Răspuns:
a+b+c = 48
a = b/3
c = (a+b)/2 = (b/3+b)/2 = b/6 + b/2 = b/6 + 3b/6 = 4b/6 = 2b/3
inlocuim in prima relatie
b/3 + b + 2b/3 = 48 inmultim cu 3
b + 3b + 2b = 48*3
6b = 48*3
2b = 48
b = 24
a = b/3 = 24/3 = 8
c = 2b/3 = 2*24/3 = 2*8 = 16
Verificare : a+b+c = 8 + 24 + 16 = 48