1. Try to figure out the answer to this math challenge.

Below is a math problem to make you really think. Try to figure out which answer is the correct one.

* There are 7 girls on a bus with NO DRIVER.

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 total legs are there in the bus?