Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2009-07-19 15:21:17

uzurpatorul
Member
Registered: 2009-06-25
Posts: 11

Diaphatus

Diophantus, the Greek mathematician known as the "Father of Algebra", supposedly had the following inscribed on his tombstone:
"Diophantus passed 1/6th of his life in childhood, 1/12th in youth, and 1/7th more as a bachelor.
Five years after his marriage, there was born a son who died four years before his father, at half his father's age."

How old was Diophantus when he died?

Offline

#2 2009-07-19 18:41:57

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,431

Re: Diaphatus

Hi uzurpatorul;

Last edited by bobbym (2009-07-19 18:42:22)


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#3 2009-07-21 00:04:25

phrontister
Real Member
From: The Land of Tomorrow
Registered: 2009-07-12
Posts: 3,811

Re: Diaphatus

That was a nice puzzle, uzurpatorul!

It took a bit of head-scratching before I could find an algebraic solution, but I finally got there.

Same answer as Bobby.

Last edited by phrontister (2009-07-21 04:42:35)


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

Offline

#4 2013-06-09 13:08:29

guin
Member
Registered: 2013-06-09
Posts: 1

Re: Diaphatus

I've worked it out backwards, but could someone please help me with the algebraic working?

I'm getting stuck on finding an LCD...should it be 28?

Offline

#5 2013-06-09 17:29:12

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,431

Re: Diaphatus


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

Board footer

Powered by FluxBB