Răspuns :
(A + B + C) :3 = 28
A + B +C = 28 X 3
A + B+ C = 84
(A + B) : 2 = 35
A + B = 70
70 + C = 84
C = 14
A + B +C = 28 X 3
A + B+ C = 84
(A + B) : 2 = 35
A + B = 70
70 + C = 84
C = 14