All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
Father and son (Posted on 2008-08-04) Difficulty: 2 of 5
A man asks his father about his age.

Instead of giving a direct answer the father wrote down two positive integer numbers on a piece of paper and says:

- Sum these two numbers and evaluate the square root of the total. Doing this, youŽll get my age.

The son takes his pocket calculator and inadvertently types the two numbers, one after the other, without pressing the "+" button (e.g. if the numbers were 124 and 357, he types 124357, instead of the sum of the numbers).

After this he makes a second mistake by pressing the square root button, not once, but twice.

Finding an integer number as the result he shows it to his father:

- This is your age.

- No, youŽre wrong, but the number you found is precisely the age of your mother, who is older than me.

How old is the father?

Note: While a solution is trivial with the aid of a spreadsheet, can you derive it without one?

See The Solution Submitted by pcbouhid    
Rating: 4.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Puzzle Answer K Sengupta2022-07-11 23:34:06
re: Apologiespcbouhid2008-08-06 21:56:28
Apologiesed bottemiller2008-08-06 11:43:17
re(2): Challengepcbouhid2008-08-06 09:00:30
re: Challengebrianjn2008-08-06 00:36:31
Derivation?ed bottemiller2008-08-05 10:42:50
SolutionSolutionDej Mar2008-08-05 01:35:45
Challengeed bottemiller2008-08-04 17:39:33
Up Up and Awayed bottemiller2008-08-04 17:21:15
Solutioncomputer solution (spoiler)Charlie2008-08-04 16:33:44
illiterate or innumerate?ed bottemiller2008-08-04 11:26:27
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (14)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information