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un taran are gaini si oi in total 77 capete si 184 picioare 
cate gaini si oi are taranul?


Răspuns :

A-GAINI,B=OI
A+B=77
2A+4b=184
2(77-b)+4b=184
154-2b+4b=184
2b=30
b=15
a=62