h+t+2+x=25 elevi
h=16
t=13
nu fac sport 2
-----------------------------
x=? (t+h)
(16+13+2)-x=25 elevi
x=31-25
x=6 elevi fac si hambal si tenis
16-6=10elevi fac doar hambal
13-6=7 elevi joaca doar tenis
6 elevi fac si hambal si tenis
2 elevi nu fac sport
10+7+6+2=25 elevi in clasa
