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intr-o curte erau iepuri , caini si pui , in total 16 capete si 48 picioare . afla cate animale sunt de fiecare fel daa iepuri sunt de 3 ori mai multi decat caini

Răspuns :

i+c+p=16
i=3c
3c+c+p=16
4c+p=16       p=16-4c
4i+4c+2p=48
4*3c+4c+2p=48
16c+2p=48      
16c+2(16-4c)=48
16c+32-8c=48
8c=48-32
c=16:8=2 caini
p=16-4c=16-4*2=16-8=8   pui
i=3c=3*2=6 iepuri
6+8+2=16     6*4+2*8+4*2=24+16+8=48  proba