The best riddles. Anywhere.
A Math Riddle, Finally
posted by Sifat - September 29 2009 10:38:18 AM
The ages of a father and son add up to 66. The father's age is the son's age reversed.
How old could they be? (3 possible solutions)
Reply by Caprico - January 04 2011 03:00:11 AM
06 and 60
15 and 51
24 and 42
For everyone else, this is how you solve it.
Let father's age be xy ( x and y are digits)
So son's age is yx

Now xy can be written as 10x + y
and yx can be written as 10y + x
[Like 56 can be written as 10(5) + 6]
Adding these two,
11x+11y + 66
x+y = 6
There are 4 integral solutions to this
x=0 y=6
x=1 y=5
x=2 y=4
x=3 y=3

Now father and son both can't be 33, so remaining are my answers. :)[/hide]

Reply by Drakelar - March 14 2011 12:36:22 AM
It is more like 24 and 42 because usually thre is a 20 year different between father and son

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