I need to make an algebra problem using a cake with the measurements 12 inches by 16 inches and 3 inches thick. There were also 30 guest there and half of the cake was left. I also need the concept being used.

Let me just say that this website is for helping you with your home work, not doing your homework. So to help you with your question, you would use all those measurements and find the volume, then you would devide that number by the number of guests and the quotien of how much cake was left depends on what you came up with for your other answers. Sorry if this was confusing! If it was you are welcome to let us know and I'm sure anyone inclueding myself will be happy to help again. Have a great night!