How much flour do we need?
Not much, just a a kilo.
How much is this T-shirt?
How many books are there in the library/bookshelf? (daca se refera la biblioteca-institutie este library, pentru biblioteca de acasa folosim bookshelf)
There are many books in the library/bookshelf.
How many armchairs do you have in the living room?
How much cheese do you eat for breakfast?