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Danut si Alina au impreuna 685 de nuci. Stiind ca Alina are cu 413 nuci mau multe decar Danut, aflati cate nuci au fiecare

Răspuns :

Danut are x nuci si Alina y nuci.
x + y = 685
y = x + 413

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