Two MIT math grads bump into each other while shopping at Fry’s. They haven't seen each other in over 20 years.
First grad to the second: "How have you been?" Second: "Great! I got married and I have three daughters now." First: "Really? How old are they?" Second: "Well, the product of their ages is 72, and the sum of their ages is the same as the number on that building over there..." First: "Right, ok... Oh wait... Hmm, I still don't know." Second: "Oh sorry, the oldest one just started to play the piano." First: "Wonderful! My oldest is the same age!"