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Gasiti cifrele x si y astfel incat nr 21x7y să fie divizibil cu 3 si 5

Răspuns :

Divizibile cu 3 : 21270,21072,21372,21273,21570,21075,21672,21276,21771,21177,21870,21078,21973,21379.
Divizibile cu 5: 21170,21175,21270,21275,21370,21375,21470,21475,21570,21670,21675,21770,21775,21870,21875,21970,21975.