B l-------------l---------------l =24 bomboane
M l-------------l---l+3
F l---l---l+3
R l---l=3 bomboane ramase
1/3=3 bomboane ramase
Fratele =1/3+3=3+3= 6 bomboane
1/2 =6+3+3=12 bomboane
B=12x2= 24 bomboane total
M=1/2 din 24+3=24:2+3=12+3
M=15 bomboane
24-15=9 bomboane
F=1/3din 9+3=9:3+3=3+3
F=6 bomboane fratele
R=3 bomboane ramase
proba
24-(15+6)=24-21=3 bomboane ramase