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

x-bancile
y-elevii
2(x-4)+1=y
3(x-10)+2=y

2(x-4)+1=3(x-10)+2
2x-8+1=3x-30+2
2x-7=3x-28
x=21 banci

2(x-4)+1=y
2(21-4)+1=y
y=2•17+1
y=35 elevi