Pensioner
John is an old pensioner. Reversing the digits of his age this year and doubling the answer gives his age next year. How old is John ?
Labels: logic, mathemagic
posted by Rajesh Lal at
11:57 PM
Monday, November 10, 2008
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12 Comments:
73
Reverse it and you get 37.
37*2=74
And of course 74 will be his age next year.
could be 1
ALBERTO AYALA says:
73 years, estimated via formula or with an excel table
if you reverse 1 you get 10 so it cant be a single digit number
And how many 1 year olds have you seen on a pension?
No he is 793 years old.
397*2=794
The next age is 7993, 79993, etc.
sam is silly; it is 73, 37*2 is 74.
He's 73.
Reversed is 37 and that doubled is 74.
How many ppl do you know that are 793 years old? o.O
How many ppl do you know that are 793 years old? o.O
793 meets criteria of old pensioner:-)
I think sam is just having fun on this but hes right there are some interesting "magic" about these two prime numbers 3 and 7.
and 9 retains these magic!
so cool and funny...
reminds me of that old grandma powdered milk joke! =D
73
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