random ramblings

I recently can across a Math problem that appears to be simple but its difficult to get the right answer. I finally managed to crack it after thinking about what I had missed out on. Its pretty easy if you don't make the wrong assumption.

In a bus there are 7 girls. Each girl has 7 bags. In each bag there are 7 big cats and each big cat has 7 little cats. So how many legs are in the bus altogether?

All the best

P.S. Please dont post the answer in the comments. You can click on this link to PM me instead.

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