Have I guessed correctly? The solution to your math(s) problem could conceivably be 42 or 137, but probably isn't. Hmmm. This is going to take more time than I first thought, so I'd better call a friend.

After all, I live across the Tasman and, as you know, nothing adds up over here.

A propos of which, a former Prime Minister of yours, "Piggy" Muldoon, was once asked what he thought of all those New Zealanders migrating to Australia, and he replied, "It will raise the average intelligence of both countries".