Question 131933
Since there are 7 girls and each girl has 2 legs there are 14 legs. 
Then there are 7 girls and each girl has 7 back packs so that is 49. and each backpack has 7 cats so in one back there are 28 legs. 28 multiplied by 7 is 196. and 196 multiplied by 7 six more times is 8232.
8232 multiplied by 2 for each small cat is 16,464 plus the 14 girls legs is 16478.

So there are 16,478 legs on the bus.