Question

daca elevii unei clase ar fi asezati cate 2 in banca ar ramabe 6 banci libere,iar 1 copil ar sta singur in banca.Daca elevii aceleiasi clase ar fi asezati cate 3 in banca,ar ramane 12 banci libere,iar intr-o banca ar sta numai 2 elevi.Cati elevi si cate banci sunt in clasa?​
VA ROG!!!!

Answer 1

notam cu x nr de banci si cu y nr de elevi

2(x-6)+1=y

3(x-12)+2=y

egalam si avem:

2(x-6)+1=3(x-12)+2

2x-12+1=3x-36+2

-x=-34+11

x=23 banci

y=2(23-6)+1

y=2×17+1

y=35elevi