In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?
Answer: The person was born in 2005 B.C. (Before Christ). Therefore, he was 5 years old in 2000 B.C, 10 in 1995 B.C, and 15 in 1990 B.C.
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