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Catalin are 2/4 din suma Irinei, iar Irina are 2/3 din suma Elenei. Cati lei are fiecare daca impreuna au 1200 lei?

Răspuns :

C+I+E=1200 
C=2/4*I=1/2*I=1/2*(2/3*E)=2/6*E=1/3*E
I=2/3*E
 Cand inlocuiesti: 1/2*E+2/3*E+E=1200=> 2E=1200=> E=600
I=2/3*E=2/3*600=400
C=1/2*I*=1/2*400=200
Verificare: 200+400+600=1200