The 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?

The number of legs is the password to unlock the Excel sheet.

If you manage to open it, then add your name and class in the appropriate columns.

[This is a real math problem, so don't say buses don't have legs.]