It depends how big you want the slices.
You should order for only 90% of your guests. Some people will not eat the cake. So again, only order for 90% - in your case that means 12 people or one cake box mix - or one 9 inch round/square cake.
Layer Cake - novel - has 240 pages.
5-7 cups, generally chocolate cake mixes yield more and white mixes yield less
Depends on how big you cut the pieces. If you cut 2x2 inch pieces, a 12x18 cake will yield 54 servings.
To make a 16-inch cake, you typically need about 2 to 3 standard cake mixes, depending on the brand and the specific recipe. A 16-inch pan usually requires around 12 to 14 cups of batter, while most standard cake mixes yield about 4 to 6 cups each. It's always a good idea to check the specific instructions on the cake mix packaging for the best results.
There are 11 cups of batter in an 11x15 pan for a 2 inch layer. I would guess for an 11x13, maybe 10 cups?
that depends on how many slices you want.
about 1 and a half
4 boxes for a single pan
To make a 16-square cake, you'll typically need about 4 to 5 standard cake mixes, depending on the brand and the specific recipe instructions. Most cake mixes yield about 4 to 5 cups of batter, and a 16-inch square cake requires around 10 to 12 cups of batter. Always check the instructions on the cake mix box for the best results.
144 1-inch squares. 36 2-inch squares.
A 12x10-inch cake that is 3 inches deep can yield approximately 30 to 40 servings, depending on how the cake is cut. For standard wedding cake servings, which are typically around 1x2 inches, you can expect to get about 36 servings if cut properly. The depth of the cake allows for a good number of servings while maintaining a nice presentation.