Răspuns :
a - numar gaini
b - numar rate
a = 7b
a - 15 = 4 x (b + 3)
7b - 15 = 4b + 12
7b - 4b = 12 + 15
3b = 27
b = 27 : 3
b = 9
a = 7 x 9 = 63
b - numar rate
a = 7b
a - 15 = 4 x (b + 3)
7b - 15 = 4b + 12
7b - 4b = 12 + 15
3b = 27
b = 27 : 3
b = 9
a = 7 x 9 = 63