a-25=b-14=c-21
25+14+21=60 kg. hrana consumata
a+25+b+14+c+21 > 25+14+21 de 2 ori...=>
a+b+c+25+14+21 =60*2
a+b+c+60=60*2
a+b+c+60=120 kg hrana ramasa
120:3=40kg hrana ramasa in fiecare sac....=> 40=40=40
a=40+25
a=65 kg.hrana in primul sac
b=40+14
b=54 kg.hrana in al 2-lea sac
c=40+21
c=61 kg.hrana in al 3-lea sac
a+b+c=65+54+61
a+b+c=180 kg.hrana in total