lol well just as an honest taxman would correct a "mistake" *cough*

.........
7 (girls) * 2 (girls legs) = 14 Girls legs (A)
if one girl has 7 back packs then 7 girls have 49 backpacks.. 49(backpacks) *7 (big cats) = 343 big cats in total *4 (their legs) = 1372 big cats legs (B)
343 (Big cats) * 7 (little cats) = 2401 little cats in total.. *4 (little cats legs) = 9604 (little cats legs) (C)
(A)+(B)+(C)= 10990