Răspuns :
B+A=16 caiete
B=A+4
_____________
A+4+A=16 caiete
2A=16-4
2A=12
A=12:2
A=6
B=6+4
B=10
B=A+4
_____________
A+4+A=16 caiete
2A=16-4
2A=12
A=12:2
A=6
B=6+4
B=10
B + A = 16
B = A + 4
A + 4 + A = 16
2A = 16 - 4
2A = 12
A = 6
B = 6 + 4
B = 10
B = A + 4
A + 4 + A = 16
2A = 16 - 4
2A = 12
A = 6
B = 6 + 4
B = 10