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danut si alina au impreuna 685 de nuci stiind ca ina are 413 nuci mai multe decat danut aflaticate nuci au fiecare

Răspuns :

d+a=685
a=d+413
d+d+413=685
2d=685-413
d=272/2
d=136
a=136+413
a=549
Danut |—|
Alina |—|+413|

685-413=272
272:2=136 nuci are Danut
136+413=549 nuci are Alina