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Daca elevii unei clase ar fi asezati cate 2 in banca ar ramane 3 banci libere,iar daca ar fi asezati cate 3 elevi in banca ar ramane 8 banci libere.Cati elevi si cate banci sunt in clasa?

Răspuns :

a/2+3=a/3+8
3a+18=2a+48
a=48-18
a=30 elevi
30/2+3= 18 banci
sau 30/3+8=18 banci