a+b+c=67 a+b+c=67
b=a/2 b=15/2=7,5
c=b/4=(a/2)/4=a/8 c=b/4=7,5/4=1,875
a+a/2+a/8=67 a=67-7,5-1,875=57,62
8a+4a+a=67*8
13a=536
a=536/13=41,23
b=20,61
c=5,15
N-ai inteles intrebarea mea. Uite rezolvarea daca e jumatate din a (prima) si daca e jumatate din 15 (a doua rezolvare)