Răspuns:
Explicație pas cu pas:
3 garoafe ........... 5 trandafiri ................31 RON (x 4)
4 garoafe..............3 trandafiri .................23 RON (x 3)
12 garoafe ..................20 trandafiri ................124 RON
12 garoafe ....................9 trandafiri ..................69 RON
20 - 9 = 11 trandafiri costa 124 - 69 = 55 RON
1 trandafir costa 55 : 11 = 5 RON
5 trandafiri costa 5 x 5 = 25 RON
3 garoafe costa 31 - 25 = 6 RON
1 garoafa costa 6 : 3 = 2 RON