Explicație pas cu pas:
f-fete b-baieti
f+b=35
f-6=(b+7)/2 =>
2(f-6)=b+7 =>
2f-12=b+7
f+b=35 => f+b+7=42 => f+2f-12=42 => 3f=54 => f=18 => b=17
f-6= (b+7)/2
2(f-6)=b+7
rezulta f+b+7=42
f+2f-12=42
3f= 42+12
f= 54:3
f= 18
b= 17
