Question

La multi ani! 
Am si eu o problema:
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 sun in clasa?

Answer 1

   
notam numaru de banci cu a
si numarul elevilor cu x
a=x/2+3,a=x/3+8=>x/2+3=x/3+8=>x/2-x/3=5|*6=>3x-2x=30=>x=30=>a=18