"How many children do you have?"

"3"

"How old are they?"

"You'll have to guess. The product of their ages is 36"

"Hmm.. too many options. What else can you tell me?"

"OK. The sum of their ages is equal to the number of the house at the other side of the street."

"I'm close, but still missing a clue"

"Right. The eldest kid plays piano"

"That's it! Thanks!"

Do you know the age of the mathematician's kids?

Ruud.