Here is a math puzzle which was on a local radio show again recently. The person who posts the correct answer will be 'required' to explain the answer. (No, I can't enforce that---but I can add necessary responses )
A census taker approaches a man on his porch and begins asking questions, one of which is: "How many children do you have, and what are their ages?"
The man replies: "I have three and the sum of their ages equals my house number".
The official thinks a bit and says he needs more information, to which the man replies: "The product of their ages is 36".
The official pauses and then indicates he still needs more facts, to which the homeowner says: My oldest child plays the piano.
What are the children's ages?