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Mathematics 11 Online
OpenStudy (anonymous):

The day before yesterday, I was 10 years old. next year I will be 13 years old. What's my birthday?

OpenStudy (anonymous):

The day before yesterday was the day before your birthday (your birthday is on December 31st). you turned 11 on December 31st, which means he'll turn 12 on December 31st this year, and 13 December 31st next year. :) December 31st is your birthday.

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