SOLUTION: The day before yesterday, Billy was 7 years old. Next year, he'll turn 10. How is this possible?

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Question 826240: The day before yesterday, Billy was 7 years old. Next year, he'll turn 10. How is this possible?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The day before yesterday, Billy was 7 years old. Next year, he'll turn 10. How is this possible?
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7 and 10 are octal, base 8, numbers.