Răspuns :
Notam f=numarul fetelor, b=numarul baietilor.
f+b=26
f-2=2*(b-3)=>f-2=2b-6=> f=2b-4
Inlocuim in prima relatie si avem:
(2b-4)+b=26=> 3b-4=26=> 3b=30=> b=10=> f=2*10-4=> f=16
f+b=26
f-2=2*(b-3)=>f-2=2b-6=> f=2b-4
Inlocuim in prima relatie si avem:
(2b-4)+b=26=> 3b-4=26=> 3b=30=> b=10=> f=2*10-4=> f=16
B+F=26
F-2=2(B-3)
F=2(B-3)+2
B+2B-6+2=26
3B=30; B=10
F=16
F-2=2(B-3)
F=2(B-3)+2
B+2B-6+2=26
3B=30; B=10
F=16