Răspuns :
3p...........2c............290g |×3
2p...........3c.............285g |×2
9p...........6c..........870g
4p...........6c..........570g
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5p.........../............400g
p=400:5=80
2×80+3×c=285
160+3c=285
3c=285-160
3c=125
c=125:3
c=41
SUCCES