b- băieți
f - fete
b+f= 63
f= b/2, => b= 2f
2f+f= 63
3f= 63
f= 63/3
f= 21 fete
b= 2f= 2•21= 42 băieți
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b- băieți
f - fete
b+f= 63
f= b/2, => b= 2f
2f+f= 63
3f= 63
f= 63/3
f= 21 fete
b= 2f= 2•21= 42 băieți