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10,990 legs


break down:

1 girls - 2 legs (per girl) x 7 girls = 14 legs
7 big cats - 28 big legs (per bag) x 7 bags = 196
7 little cats - 196 little legs (per bag) x 7 bags = 1372

1372 little legs + 196 big legs = 1568 x 7 bags per girl +14 girl legs = 10990