Question

URGENT!!! Intr-o clasa sunt 35 de elevi,fete si baieti.Daca din clasa pleaca 6fete si vin 7 baieti,atunci numarul fetelor ar fi jumatate din numarul baietilor

Answer 1

35-6[fete]=29
29+7[baieti]=36
36:3=12[fete]
12+12=24[baieti]

Answer 2

$\left \{ {{x+4=35} \atop {2(x-6)= y+7}} \right. <=> \left \{ {{x=35-y} \atop {2x-y=19}} \right. <=> \left \{ {{x=35-y} \atop {2(35-y)-y=19}} \right. <=> \left \{ {{x=35-y} \atop {70-2y-y=19}} \right.$$<=> \left \{ {{x=35-y} \atop {-3y=19-70}} \right. <=> \left \{ {{x-35-4} \atop {-3y=-51}} \right. <=> \left \{ {{x=18} \atop {y=17}} \right.$

x - fete
y - baieti