Read the following paragraph and answer the questions that followBob is a student. This is his bedroom. He does his homework, play computer games and relax here. There is a desk, a chair, a wardrobe, a bed and a bookshelf in his room. The wardrobe is between the desk and the bed. There is a computer, ten books and five pens on his desk. There are some pictures of his family on the wall. He loves this room so much, so he cleans it regularly.How many pens are there in his desk?