galbene=G
albe=A
rosii=R
șatirate=S
avem :S+R+A+G=81
G=2A
A=R-2 deci R=A+2
S=(R+G+A):2
calculam:
2S=R+G+A
inlocuim in prima relatie:
S+2S=81
3S=81
S=81:3=27
R+G+A+27=81
R+G+A=81-27=54
inlocuim:
A+2+2A+A=54
4A=54-2
A=52:4
A=13
G=2A=2x13=26
R=A+2=13+2=15
verificare:
27+15+13+26=81