Question

daca intr-o sala de clasa elevii se asaza cate doi intr-o banca,raman 5 elevi in picioare, daca se asaza cate trei intr-o banca, raman 2 banci libere.cate banci si cati elevi sunt in clasa?

Answer 1

x-elevi
y-banci
2y=x-5
x:3=y-2

2y-x=-5
x-3y=-6
x=3y-6

2y-3y=-11
y=11banci
x=27 elevi