







When is John's next birthday on a Friday? 
20190315 

Darek pose la question : The question is the following:
Last Friday 4th of April of 2014 John was 40 years old. How old will John be the next time when his birthday fell on Friday?
Thanks for your help Penny Nom lui répond. 





On what day of the week was July 4, 1904? 
20140111 

Madi pose la question : Hi guys,
I have a question. July 4, 1903, was a Tuesday. On what day of the
week was July 4, 1904? If you could give me an equation that would
work for any question like this, that would be GREAT!
Your fellow math scholar (in training),
Madi Penny Nom lui répond. 





When will the calendar be the same as 2002? 
20020220 

John pose la question : When will the calendar be the same as 2002? I know the answer is 2013, but I don't know how to answer this mathematically, or if it is possible to do so. This is a ninth grade level algebra question my daughter received from her teacher. Any ideas? Chris Fisher, Patrick Maidorn and Penny Nom lui répond. 





The astronomers' calendar 
20001129 

Show_Li pose la question : The calendar that astronomers use began on Jan. 1, 4713 B.C. on that day, the julian calendar, the lunar calendar, and roman tax system calendar all coincided. This won't happen again until 3267 A.D. (a). How many years ago was the astronomer's calendar started? (b). Find the number of years between times that the three calendars coincided. Penny Nom lui répond. 





Prime dates 
19990325 

Jessica Brown pose la question : I'm asking how do you figure out all the prime numbers in a year and, whats the average amount of prime numbers per week. Jack LeSage and Penny Nom lui répond. 





The day of the week, July 24, 1837 
19980321 

Colleen K. pose la question : What day of the week (Mon. Tues. Wed. etc...) was July 24th, 1837? Chris Fisher lui répond. 

