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Alexandra are de 5 ori mai multe mere decat Corina. Cate mere are fiecare daca impreuna au 18 mere?

Răspuns :

[tex]\text {Metoda~algebrica~:}[/tex]

A+C=18 mere
A=5×C
__________
5×C+C=18 mere
6×C=18 mere
C=18:6
C=3 mere
A=5×3
A=15 mere