Răspuns:
1pix..........1caiet.........1stilou=12lei
2pix.........3caiet.........2stilouri=26lei
3pix..........2caiet........1stilou=16lei
1caiet=2lei
1pix=?lei
1stilou=?lei
Explicație pas cu pas:
2*3=6lei 3 caiet , 2*2=4 3caiet
12-2=10
10:2=5lei 1 pix si 1 stilou
2pix=10lei
3pix=15lei
2stilou=10lei
1stilou=5lei