Explicație pas cu pas:
notam c-ciocolata
p - prăjituri
7c......12p.....3275g/×5
5c.......8p.....2225g /×7
35c....60p....16375g
35c......56p . ..15575g
4p = 800g
1p= 200g
5c + 8× 200= 2225
5c+ 1600 = 2225
5c = 625
1c = 125g
atunci:
4×200 + 4× 125 = 800+ 500= 1300g