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Beti,valentina si costi colectioneaza timbre. cate timbre are fiecare in colectie,daca beti si valentina au impreuna 286 timbre,valentina si costi au
impreuna 379 timbre,iar cei trei copii au in total 413 timbre


Răspuns :

Faci 379-286=93 Beti   dupa 379-93=286 Valentina

 dupa 413-379+286+93 sper ca team ajutat imi dai coroana pls!
b+v + c = 413
b + v = 286
v + c = 379
286 + c = 413
c = 413 - 286
c = 127 ( timbre are costi)
v + c = 379
v + 127 = 379
v = 379 - 127
v = 252 ( timbre are Valentina)
b + v = 286
b + 252 = 286
b = 286 - 252
b = 34