7*(2+ 7*((7+1)*4)) Thats it. calculate the rest.

RBaral (latest posting below) is right, that it is question probably designed like:

Two ants were riding motorbike, and their motorbike hit a tree. What happend to ant?

Answer: Nothing, because ants had helmet.

Similarly, the girls had shoes and pants, cats were inside the bag, .... so no leg in the bus, bags, and shoes, panes contained legs .... The other answer someone wrote here is also one possible answer: Bus does not have leg, it has wheels. We can have multiple answer to this vague questions. It serves the purpose. Anything can be justified. It is a passtime stuff, in this winter break, right. Happy holidays.