Two old friends, Jack and Bill, meet after a long time. Jack: Hey, how are you man? Bill: Not bad, got married and I have three kids now Jack: That’s awesome. How old are they? Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date. Jack: Cool … But I still don’t know. Bill : My eldest kid just started taking piano lessons. Jack: Oh now I get it. How old are Bill’s kids ?