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Le di a mi hermana=3/5.
Me quedó=1-3/5=2/5.
Le vendí a mi tía=(10/15).(2/5)=20/75=4/15.
Me quedó=(2/5)-(4/15)=(6-4)/15=2/15.
Sol: 2/15 de los chocolates me quedó.
Un saludo.