Răspuns :
f |-----| } 63
b |-----|-----|
63 : 3 = 21 copii ( un segment )
f = 21
b = 21 × 2
b = 42
b |-----|-----|
63 : 3 = 21 copii ( un segment )
f = 21
b = 21 × 2
b = 42
|___| fete
|___|___| baieti } 63 copii
1s + 2s = 63
3s = 63
1s = 21 fete
2s = 42 baieti