Perseus had lived one-fourth of his life as a boy, one-fifth as a youth, one- third as a man and has spent thirteen years in his dotage. How old is Perseus ?
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Let Perseus be x years old.
Therefore,
x − ( 4 1 x + 5 1 x + 3 1 x ) = 1 3 6 0 1 3 x = 1 3 x = 6 0