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Rosita se comió 3/8
→ 1 - 3/8 = 8/8 - 3/8 = 8-3 / 8 = 5/8
Queda 5/8 del pastel.
Ahora susana se come 1/4 de esos 5/8
5/8 - 1/4 = 5/8 - 2/8 = 5-2/8 = 3/8
Queda 3/8 del pastel.
La respuesta no es 15/32 ; es 3/8