Răspuns :
Reanalizare:
2 elevi in banca.....raman 6 elevi
3 elevi in banca.....raman 2 bănci
Rezolvare:
2×2+6=10
3-2=1
10:1=10
10+2=12 banci
12×2+6=30 elevi
R:30 elevi, 12 banci
notam e=nr elevi, b=nr banci
repartizam elevii, unii in banci unii nu
e= 2*b+5
e=4*(b-4) + 1*1+3*0
egalam
2b+5=4(b-4)+1
2b+5=4b-16+1
2b=20
b=10
e=2*10+5=25
10 banci, 25 elevi