There are seven girls = 7 girls

These seven girls have seven bags apiece = 49 backpacks

In each backpack there are seven big cats = 343 big cats

And for each big cat there are seven small cats = 2401 small cats

Now we must find out how many legs are on the bus.

Assuming that each girl has two legs, and each cat has four,

7(2) + 343(4) + 2401(4)

10990

So there are 10990 legs on the bus.

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ans= 10990There are seven girls =7 girlsThese seven girls have seven bags apiece =49 backpacksIn each backpack there are seven big cats =343 big catsAnd for each big cat there are seven small cats= 2401 small catsNow we must find out how many legs are on the bus.Assuming that each girl has two legs, and each cat has four,7(2) + 343(4) + 2401(4)10990So there are 10990 legs on the bus.