ignoring the fact that i have no children, here is the question: (this is really a dialogue between dimitry and fred) dimitry: hi fred fred: hi dimitry: hows it going? fred: fine, you? ... (after 1 hour of small talk) dimitry: hey fred, how old are T@P's children? fred: if you multiply their ages (in years), you get the age of Tom. dimitry: hmmmm thats not enough. any more clues? fred: if you add their ages (in years) you get the number of windows in that building over there. dimitry: cmon fred thats still not enough. how old are they? fred: T@P's middle son has blue hair (like some anime character!) dimitry: ok thanks for telling me theire ages. fred: bye dimitry: bye so how old are they? some small clarification: dimitry does not know toms age. also i have 3 children.