that depends on how many slices you want.
It depends on how deep the cake pan is.
Yes
It all depends on how thick the cake is. Try using a 10 inch or 12 inch pans that are 3 inches deep. Or you can do 8 inch, 10 inch, and 12 inch that are 2 inches deep and double layer each one and that would be enough. Where I live its hard to find 3 inch deep cake pans. See the Cakefairy link below for a listing of cake sizes per servings.
It depends on how big the cake is. So it is possible. But you would need an awfully large cake. A million is a larger number than it seems. A 12"x16" (30 x 40 x 10 cm) cake contains about 12,000 cm3 of cake. If you divided it into 1,000,000 equal pieces, each would be about 1/80 cm3 (about the size of this letter "o" ) and weigh about 1/200 of a gram. This might be referred to as "one or two crumbs". To get a regular slice of cake (15 x 10 x 1.5 cm), your cake would have to measure 1500 x 1000 x 150 cm, or as big as FIFTEEN large military Humvee's. That's a big cake!
If it calls for a 9 inch springform pan which holds about 10 cups one may use: 1 (10-inch) round cake pan 1 (10-inch) springform pan 2 (8-inch) round cake pans 2 (9-inch) round cake pans If it call dor a 10 inch springform pan which holds about 12 cups one may use: 2 (8 x 4-inch) loaf pans 1 (9-inch) tube pan 2 (9-inch) round cake pans 1 (10-inch) Bundt pan 2 (11 x 7-inch) baking dishes 2 (8-inch) round cake pans
A ten inch cake feeds about 12 people if you cut it in wedge like triangles, like a pizza. However if you go to wilton.com and look at the cutting guide, they say it feeds 38, realisticly, more like 30. That is if it is at least 2 layers. and those are uniform peices so everyone gets the same amout of cake. I like this way. it makes the cake go farther and no one eats half a piece and throws away the rest. and if people want more they can always go get another piece.
About 10 cm
10 inch
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.
1/2 way filled
It depends on you! I eat half of a slice of pound cake every day and it's the perfect amount for me. It soothes my sweet tooth and doesn't make me feel gross.
Chocolate cake is a food that players can make with a cooking level of 50, heals 150 life poins when consumed and yields 180 cooking experience for making a cake and 30 cooking experience for adding the chocolate. Each slice of chocolate cake heals 50 life points when consumed, which is 10 more than a plain cake. When one bite is taken out, it becomes a 2/3 chocolate cake. When two bites are eaten, it becomes a chocolate slice. Sources: http://runescape.wikia.com/wiki/Chocolate_cake