a+n+r=600 kg.s
n+r=500 kg s
a+r=300 kg.s
.............................
a=? n=? r=?
r+n) |__|__|__|__|__|
a+r) |__|__|__|
----------------------------
a+n+2r=800 - (minus)
a+n+r =600
-----------------------------
0+0+r=200
r=200 kg.struguri roze
n=500-200
n=300 kg.struguri negri
a=300-200
a=100 kg.struguri albi
100+300+200=600 kg.struguri in total