Question

daca elevii unei clase ar fi asezati cate 2 in banca , ar ramane 3 banci libere,iar un elev ar sta singur in banca ,iar daca ar fi asezati cate 3 in banca ,ar ramane 9 banci libere , iar intr-o banca ar sta numai 2 elevi.Cati elevi si cate banci sunt in clasa

Answer 1

a=banci
b=elevi
b=2(a-4)+1
b=3(a-10)+2
Le egalam:
2(a-4)+1=3(a-10)+2
2a-8+1=3a-30+2
2a-7=3a-28
3a-2a=28-7
a=21 banci
b=2(21-4)+1
b=2*17+1
b=35 elevi