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Daca se aseaza cate 2 elevi in intr-o banca raman 5 elevi fara loc,iar daca se aseaza cate 3 elevi  intr-o banca raman 2 banci goale si un singur elev.Cate banci si cati elevi sunt?

Răspuns :

x-nr de banci

2(x+5)-nr de copii
3(x-2)-nr de copii

2x+10=3x-6

2x-3x=-6-10

-x=-16
x=16

2(16+5)=2*21=42 de elevi


x-banci

y-elevi

2(x+5)=y

3(x-2)=y

2x+10=3x-6

3x-2x==16

x=16

y=2(16+5)

y=2*21

y=42

y=3*(16-2)

y=3*14

y=42