Unless you put the 3rd layer on it's own board, when cut you will just have an extra tall piece of cake and the servings will not increase. Using a cake board w/the 3rd layer will allow 1/2 the # of servings cut from the 2 layer cake so you should end up with about 50 servings from the 10" and about another 18 or so from the 6"er (12 from the 2 layer + 6 from the 3rd layer.)
Cutting and serving a 6" high cake is a pain regardless of what size it is. The pieces look very small on plates...
Two-layer cakes 12" and 8" round look nicely proportioned if they end up 3.5-4" high, and they will serve the required number of people. They do not look "large".
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