I have 3 different size book cake pans...anywhere from about 3/4 of a cake mix to a bit over 2 cake mixes. If you are carving from a rectangle, you can make it what ever size you need to get the number of servings.
That 8x11 pan will only serve some 15-20. You will need to make at least 4 of them. You could do that by placing 2 of them side-by-side (actually tight together) and stacking the other 2 on top of those for a 16x11x4 cake. By the time you cut the 'v' out of the center & slope the sides for the book shape it should be just right.
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