Each of the questions below consists of a question and three statements numbered I, II and III given below it. You have to decide whether the data provided in the statements are sufficient to answer the questions. What is Sweta's rank from top in a class of 45 students?
I. Sweta is five ranks below Sanjay, who is 15th from the bottom. II. Ravina is 30th from the top and Neha is 4th from the bottom. III. Sweta is exactly in the middle of Ravina and Neha.