Question

Daca asazam cate 3elevi in banca raman 5 banci libere,daca asezam cate 2 elevi in banca raman 5 elevi in picioare .Cati elevi si cate banci sunt in clasa???

Answer 1

x = nr elevi
a=nr banci

x/3 =a-5
(x-5)/2=a
a=x/3+5
x-5=2a
x-5=2x/3+10
3x-15=2x+30
x=45
a=x/3+5=20
45 elevi /3= 15 banci ocupate   20-15 = 5 banci libere
20 banci ocupate x2 = 40elevi          45-40=5 elevi in picioare