Magician 1: "The sum of the ages of my children is the number on the front
of this bus,
and the product of their ages is twice my age."
Magician 2: "Well, that's not very informative. Aside from the number
on the front of this bus, I know practically nothing.
If you were to tell me your
age and the number of children you have, could I then work out their
Magician 1: "No, you couldn't."
Magician 2: "Maybe not, but at least I now know your age."
The problem is to determine the number on the front of the bus.