This is not a trick question.
There is no bus driver
This is a real math problem.
There are 7 girls in a bus.
Each girl has 7 backpacks.
In each backpack, there are 7 big cats.
For every big cat there are 7 little cats.
Question: How many legs are there in the bus?
You may use a calculator, spread sheet, slide rule or whatever.
Personally I advise a formula on piece of paper first.
I have turned off all cat-ulators in your vacinity.
Consulting your cat will give you nothing but a vacant stare.
Wall of Honour.
See the Wall of Honour with the Names who Humans
with enough grey matter to get to right.
Beta edition went online 26th July 2008.