Hi all - I have a request for a cake shaped/carved into a cross. It needs to serve 40. I was thinking of making two 11x15s and stacking them, then carving the cross. Will that be enough...way too much?? I'm just thinking two 9x13s doesn't seem very big. Anyone good w/servings?? 
I would say diagram it out and do the math. How big are you going to cut the pieces (1x2x4?) and how wide is the cross? For simplicity sake, let's assume the cross is 4" wide all the way. The tall part would be 15x4 and the "arms" would be 11x4. Cut each in half lengthwise. So now you have two 11x2's. If you cut those in pieces 1" wide (to give you the 1x2x4), then you have 22 pieces in the arms. Do the 15x4 the same way (although you've lost some of it when you cut the 11" piece.
I hope that helps and isn't very confusing. But it depends on how much you carve away. Normally, a 2-layer 11x15 will serve 70, in 1x2x4 pieces.
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