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Bunica are 22 pasari. Daca ratele sunt de doua ori mai putine decat gainile, iar curcile cu6mai multe decat ratele, afla cate pasari sunt de fiecare fel.

Răspuns :

r+g+c=22
2r=g
c=r+6 scriem tot in fct de r 
r+2r+r+6=22 4r=22-6  r=4 
g=4x2=8 
c=4+6=10  
4+8+10=22  adevarat
I------------I=r
I------------I------------I=g
I------------I+6=c
I------------I-------------I-----------I------------I+6=22
I------------I--------------I----------I------------I=22-6=16 
I-------------I=16/4=4  DECI R=4 G=4X2=8  C=4+6=10