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Gasta 2/3 en 1 libro
Le queda: 3/3 - 2/3 = 1/3 de 25€
25 € × 1/3 = 25/3 €
Gasta: 3/5 de lo que le quedaba
Le queda: 5/5 - 3/5 = 2/5 de 25/3 €
25/3 € × 2/5 = 50/15 €
50/15 € = 3.333 €
En resumen:
25 • (3/3 - 2/3) • (5/5 - 3/5) =
25 • 1/3 • 2/5 = 50/15 = 3.333 €
R. Vuelve a casa con 3.333 € (euros)