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X(2/5) = 2X/5 Gasto en Regalo
Queda: X - 2X/5 = 5X/5 - 2X/5 = 3X/5
Quedan: 3X/5
Libro (3X/5)(1/3) = X/5
Quedan: (3X/5) - X/5 = 2X/5
2X/5 = 16 €
2X = (16)(5)
2X = 80
X = 80/2
X = 40 €
Tenia ahorrados 40 €
Regalo = 40(2/5) = 16
Regalo = 16 €
Libro = 40/5 = 8
Libro costo 8 €