Răspuns:
Pix-p Caiet-c
2p.....3c.....13lei
4p.....1c......11lei
1c=?
1p=?
2p.....3c.....13lei ×2
4p.....1c......11lei
4p....6c.....26lei
4p.....1c......11lei
Taiem 4 cu 4 si rămâne
5c=15
C=15
5
C=3lei 1 caiet costa 3
2p......3c.......13lei
4p......1c........11lei ×3
2p......3c......13 lei
12p.....3c.....33lei
Taiem 3 cu 3 si rămâne
10p....20lei
P=20
10
P= 2lei 2 lei costa un pix