Originally Posted by

**thyristor**
Nice point, but unfortunately wrong.

The three girls can be of the ages 1,1,36 1,2,18 1,3,12 1,4,9 1,6,6

2,2,9 2,3,6.

The sum of these ages are 38,21,16,14,13,13 and 11.

Since the man knows his own house number he to be able to know their age know but there are two with the sum 13. When his neighbour then says that her eldest daughter plays football he knows that she can't have two girls of the same age that are older than the last one and therefore it must be 2,2,9.