Two men, both the same age, sitting in a Railway Station waiting for their trains, struck up a conversation. One said to the other,' I have three sons. Let's see how many clues I have to give you before you're able to figure out their ages. To make it easy, we'll deal in the whole years only. The question is, what are their ages next birthday?"
The other man agreed to give it a try. The first man continued.
One: the sum of my sons ages is 13. The second man shook his head.
Two: the product of their ages is the same as your age.
"Carry on," said the second man.
Three: my oldest son weighs 91 pounds.
"Stop," said the second man, " I think I've got it.'
What was his solution?