farrah,
for me, I put together (2) 12 x 18's together to make a full sheet. I'm not sure on the approximate number of servings either because it seems that everyone has their own serving sizes or what-not. But for me my full sheets will serve 70+. I'm still a beginner but I put my two cakes together and when I ice them, I start in the middle and work around the crack to avoid a gap. Hope this helps some! - Kenya
I've only done one full sheet and I used 2 of the 11x15.
I put them side by side and trimmed the crust and glued them together with the icing.
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