Assignment:
This is a 5th grade math problem. This is not a trick question. This is a real, straight-forward math problem, so don't say that "a bus has no legs", even though that would be a good "lateral thinking" type of answer. You don't count any undescribed driver, nor any boys who might also be on the bus. The problem is neither more nor less than as it appears below.
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.
- How many legs are there in the bus?
Provide complete and step by step solution for the question and show calculations and use formulas.