While boarding a bus you notice that there are 7 girls in the bus already. All the girls have 7 bags each. In each bag there are 7 adult cats. Each of the adult cat have 7 little one. Each of the cat has 4 legs.

Can you calculate the number of legs in the bus?

Every girl has seven bags comprising of seven adult cats each with seven little cats per adult cat.

Thus for one girl:

1 girl + 49 adult cats + 343 little cats

Since there are 7 girls:

7 girls + 343 adult cats + 2410 little cats

Now calculating the legs:

14 legs of girls + 10976 legs of cats (There are total 2744 cats with 4 legs each).

Thus total legs = 10990

Now I climbed aboard the bus as well, thus total number of legs = 10990 + 2 = 10992 legs

If we add two legs of the driver as well,

Total legs = 10992 + 2 = 10994