Abe reads a book every day some page in the morning and some in the evening. He reads 23 pages every morning and 31 page every evening . The number of page completed by Abe after some number of days can be written as a function of the number of pages read in the evening . If the number of days is represented by ' N', the number of page read in the morning be 'M' and the number of pages read in the evenings be 'E' , which of the following the number of days for which Abe read the book ? It is know that if Abe read in the morning , he did not read in the evening and vice versa.