7 girls, 49 backpacks, 343 big cats, 2401 small cats
have
2legs, 0 legs, 4 legs, 4 legs respectively.
(7x2) + (49x0) + (343x4) + (2401x4)
=10,990 legs.
have
2legs, 0 legs, 4 legs, 4 legs respectively.
(7x2) + (49x0) + (343x4) + (2401x4)
=10,990 legs.