A number theory problem by Ahmet Cemiloğlu

Number Theory Level 2

Paul died on Sunday, 03 February 2013 at the age of 73 years 1 month and 3 days old. What day was he born?

Monday, 1 January 1940 Sunday, 31 December 1939 Wednesday, 31 January 1940 Friday, 24 November 1939

Ahmet Cemiloğlu by Ahmet Cemiloğlu , 35, Indonesia

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1 solution

Denton Young
Dec 26, 2015

Work backwards. Take off the 3 days: he was 73 years, 1 month old on Jan 31 2013.

So he was exactly 73 years old on Dec 31 2012.

Therefore, he was born on Dec 31. 2012-73 = 1939. So he was born on Dec 31 1939.

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Moderator note:

It's interesting how taking a different order could lead to varying results.

Y cant a month stand for 30 days??

Ganesh Ayyappan - 5 years, 5 months ago

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Because in this case, January has 31 days.

Denton Young - 5 years, 5 months ago

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perhaps im still not able to accept that 1 month = 30 days i wrong ... coz thats a standard thing most of us consider for easy Calc.

Ganesh Ayyappan - 5 years, 5 months ago

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@Ganesh Ayyappan – Unfortunately, there are no easy calculations here because this problem uses the screwed-up calendar we currently use, not one designed for easy calculation. Of course, since 1 year = 365.2422 days long, it's just about impossible to come up with a calendar that makes any sort of sense. That's a very inconvenient number.

Denton Young - 5 years, 5 months ago

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