"I've always been 45 years older than your Dad", said Grandma to young grandson.

"But now the two digits in my age, both prime, are the reverse of the two in your Dad's age".

How old is Grandma?

(In reply to solution by akila)

that was over solved. it took me three seconds to sole this as im sure it did a lot of other people. there are only 5 prime single digit numbers 1,2,3,5 and 7. shes a grandma shes probably old you think first digit is 7. i usually use formulas and not guess and check but in this case with such a small number of numbers to work with why waste time making a formula. I didn't thik of thaat though andi aplaud you

Posted by mike on 2003-10-30 21:08:13