Margaret is reading a book. the number of pages she has left to read is 276−35d276−35d , where d represents the number of days she has been reading. what does each part of the expression represent?

35=
276=
35 d=

(options for answers: the number of pages read during one day, the total number of pages in the book, the number of pages she has read during d days, the number of pages she has read during 1 week)

i believe these are the answers but, i am not sure!

35= the number of pages read during 1 day
276= the total number of pages in the book
35d= the number of pages she has read during d days, the number of pages she has read during 1 week

!