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Un bec rosu=5becuri albastre+8 becuri verzi
o ghirlanda=15 becuri rosii
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162 ghirlande= ? becuri


Răspuns :

1 ghirlanda................15*5 albastre.................15*8 verzi
162.............................x..................................y

x=162*15*5=12150 albastre
y=162*15*8=19440 verzi