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?

2(7) + 7(7)(4) + 49(7)(4)
14 + 196 + 1372 = 1582
But to be technical, there are 14 legs and 1568 paws.
:)

Yeah
I tried that and it's wrong. It's driving me bananas!

... you count the driver of this bus?

10990 not including bus driver's legs. See
"Legs and girls and buses read" post.

To explain it I would like to make a chart

Girls 1 2 3 4 5 6 7

B.Pack 7 7 7 7 7 7 7

Big cats 7x7 7x7 7x7 7x7 7x7 7x7 7x7

Total Big cats for seven girls= (7x7)x7=343 ---------A
Each big cat has 7 small cats so total small cats=343x7=2401----------B
Total cats =A+B=343+2401=2744
Total legs for cats = 2744x4=10976
Total legs for girls=7x2=14
Therefore total legs for girls and cats=10976+14=10990 (except bus driver)
I think giani513 answer is correct