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5 prajituri................. 2ciocolate.................. 26 lei
8prajituri...................2 ciocolate................. 38lei


Răspuns :

Le scadem
3p=12lei
p=4lei
20………2c….……26lei
2c=6lei
c=3lei
5p+2c=26 |(1)
8p+2c=38| (2)
(2)-(1)
3p=12
p=12:3
p=4lei o prajitura costa 4 lei
8p+2c=38 |:2
4p+c=19
c=19-4×4
c=19-16
c=3 lei. o ciocolata costa 3 lei
p: 5×4+2×3=20+6=26
8×4+2×3=32+6=38