Question

Bunicul a cules 600 kg struguri albi,negri si roz.Stiind ca 500 kg nu sunt struguri albi,iar 300kg nu sunt negri,afla cate kg din fiecare fel de struguri a cules bunicul.Rezolvare cu plan.

Answer 1

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