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How Old is Santa Claus?

While you are visiting Santa Claus at the mall, he gives you a riddle to find out how old he is. He says, “I started work when I was 15. I spent 1/4 of my working life in a factory, then 1/5 of my working life in an office, and 1/3 of my working life as a school caretaker. For the last 13 years I’ve been working as Santa Claus. How old am I?”

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