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 Father and son (Posted on 2008-08-04)
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 No Rating

Comments: ( You must be logged in to post comments.)
 Subject Author Date re: Apologies pcbouhid 2008-08-06 21:56:28 Apologies ed bottemiller 2008-08-06 11:43:17 re(2): Challenge pcbouhid 2008-08-06 09:00:30 re: Challenge brianjn 2008-08-06 00:36:31 Derivation? ed bottemiller 2008-08-05 10:42:50 Solution Dej Mar 2008-08-05 01:35:45 Challenge ed bottemiller 2008-08-04 17:39:33 Up Up and Away ed bottemiller 2008-08-04 17:21:15 computer solution (spoiler) Charlie 2008-08-04 16:33:44 illiterate or innumerate? ed bottemiller 2008-08-04 11:26:27

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