Răspuns :
f=nr fete
b=nr baieti
f=3b/4
f+b=350
3b/4+b=350/*4
3b+4b=1400
7b=1400
b=200
f=350-200=150
b=nr baieti
f=3b/4
f+b=350
3b/4+b=350/*4
3b+4b=1400
7b=1400
b=200
f=350-200=150
f+b=350
f=3/4b
3b/4+b=350amplificam
3b+4b=1400
7b=1400=>b=1400:7=>b=200 sunt baieti
f=3/4din200=150 sunt fete
f=3/4b
3b/4+b=350amplificam
3b+4b=1400
7b=1400=>b=1400:7=>b=200 sunt baieti
f=3/4din200=150 sunt fete