Math wizards: I need a formula for calculating number of pages in a scrapbook album?

Ok, I am a scrapbooker. I make albums using the double page layout style. This means pages facing each other are one layout, theme, picture event (ie birthday, camping, vacation, etc.). Not counting the first page in the book or the last page, how can I figure out how many individual pages I will need if I know that I will have X number of events in my album. One more detail. pages are used back to back. this means that if I have two double page layouts I only need 3 actual pages because the middle page front and back acts as one-half of each layout. Thanks for not making me reach far back in my brain and dig out the algebra!

Well, you want 2x faces (since you need two faces per event). And each page yields 2 faces (front and back), so you need at least X sheets of paper. But you don't use the front of the first or the back of the last, so you need to add 1, thus you need X+1 sheets of paper for X themes.

Scrapbook Ideas & Tips : How to Make a Vacation Scrapbook

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