Răspuns :
3c.........3b.......21ron
3c...........4b......24ron
-------------------------------
/................1b........3ron
1b=3
b=3:1
b=3(ron un pachet biscuiti)
3×3+3c=21
9+3c=21
3c=21-9
3c=12
c=12:3
c=4(ron o ciocolata)
3c...........4b......24ron
-------------------------------
/................1b........3ron
1b=3
b=3:1
b=3(ron un pachet biscuiti)
3×3+3c=21
9+3c=21
3c=21-9
3c=12
c=12:3
c=4(ron o ciocolata)