Even Santa is clever!!!

Algebra Level 2

8-year-old Samantha visited Santa at a local department store. He gave her this riddle: " I started working at 15. I spent 1/4 of my working life in a factory. I spent 1/5 of my working life in an office, and I spent 1/3 of my working life as a school caretaker. For the last 13 years of my working life I've been Santa Claus. How old am I?" Help Samantha find his age.

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