What is the age of the father, mother and the daughter?

A lecturer went to a class one day and the following conversation occurred between the lecturer and a female studentLecturer: how old are you?Student: i don't know my age but i know am half of my mother's age!Lecturer: how old is your mother?Student: i don't know but i know my father uses 5 years to pass my mother's aged!Lecturer: how old is your father?Student: i don't know, but if you add all our age together our age is 100.How old is the father, mother and the daughter?

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