Question

4 kg rosi+5 kg castraveti=8,8 lei
5 kg rosi+4 kg castraveti=9,2 lei
1 kg rosi=?
1 kg castraveti=?

Answer 1

r-rosii
c-castraveti
4r+5c=8.8
5r+4c=9,2
r=(8,8-5c)/4
5*(8,8-5c)/4 +4c=9,2
(44-25c+16c-36,8)/4=0
7,2-9c=0
-9c=-7,2
c=0,8
r=4,8/4
r=1,2