How to Solve the Riddle and Open the Attached File with a Password Based on a Bus Scenario with Cats

There is a file attached. The clue for opening this file is: Only skilled people can open this file. Once you succeed in opening this file, you will find the names of the people who have managed to open this. Now it is your move!

How to open the attached file? Here's the clue.

There is a bus with 7 girls. Each girl has 7 bags. In each bag, there are 7 big cats. Each big cat has 7 little cats.

Question: How many legs are present in the bus?

The number of legs is the password to open the attached file.

If you open the file, write your name on the list inside and send this email to your friends to let them solve this riddle.

(See attached file: Prove U R Genius (5).xls.zip)

To find the number of legs present in the bus, we need to calculate the total number of legs of all the entities mentioned in the riddle. Here's the breakdown:
- 7 girls x 2 legs each = 14 legs
- 7 girls x 7 bags x 0 legs (bags don't have legs) = 0 legs
- 7 girls x 7 bags x 7 big cats x 4 legs each = 1372 legs
- 7 girls x 7 bags x 7 big cats x 7 little cats x 4 legs each = 9604 legs

Adding all these up: 14 (girls) + 0 (bags) + 1372 (big cats) + 9604 (little cats) = 10990 legs. Therefore, the password to open the attached file is "10990".