Răspuns :
a-elevii,din,7A
b-elevii,din,7B
a+b=64
a-2=b+2=>a-b=4=>a=b+4
b+4+b=64
2b=30
b=30
a=34
b-elevii,din,7B
a+b=64
a-2=b+2=>a-b=4=>a=b+4
b+4+b=64
2b=30
b=30
a=34
A+B=64
A-2=B+2
A=B+4
B+4+B=64
2B=64-4
B=60/2
B=30
A=30+4=34
R:30 de elevi invata in clasa a 7-a B.
A-2=B+2
A=B+4
B+4+B=64
2B=64-4
B=60/2
B=30
A=30+4=34
R:30 de elevi invata in clasa a 7-a B.