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Mathematics, 24.04.2020 18:12 boss1373

En una petita llibreria de segona mà en un dia han venut 21 llibres. Hi ha tres models de llibres: l'A, el B i el C. Un llibre del model A costa 7 euros, un del model B 5 euros i un del model C 12 euros. Sabent que han venut dos llibres més del model C que del B i que del model C han venut 7 llibres, quants diners en total han guanyat en aquest dia?

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En una petita llibreria de segona mà en un dia han venut 21 llibres. Hi ha tres models de llibres: l...

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