There are 2 closets with 3 shelves. There are 5 backpacks on each shelve. So you would multiply 2x3=6. then you'd multiply 6x5 since there are 6 shelves in total and there are 5 backpacks on each shelve. which gives you 30 backpacks in total.
The Knight is dressed in a tunic made of coarse material ; he wears a suit of armor that is stained by rust. He has a horse which he take care of it better than himself.