Răspuns:
Buna ✍✍✍
b=banci
2b+1=3(b-4)+1→ elevi
2b+1-1=3b-12
12=3b-2b⇒b=12 banci
3(12-4)+1=3·8+1=25 elevi
Verificare:
12banci·2elevi=24elvi+1elev in picioare = 25 elevi in clasa
dar pot fi 10 banci si 21 de elevi
10banci·2elevi=20 elevi+1 elev in picioare =21 elevi in clasa
Miraculos15(❁´◡`❁)