SOLUTION: Jenny build a pyramid out of sugar cubes to model a Mayan pyramid. Each layer is a solid square of sugar cubes and the pyramid looks the same on all four sides. The bottom layer sh

Question 1024150: Jenny build a pyramid out of sugar cubes to model a Mayan pyramid. Each layer is a solid square of sugar cubes and the pyramid looks the same on all four sides. The bottom layer shows 10 cubes along each side. The next layer shows 9 cubes along each side and so on ending with one cube on top. Jenny paints all the surfaces of the pyramid that are showing. How many cubes have no paint on them?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

The number of unpainted cubes is the same as the number of cubes it would take to create a similar pyramid where the base is only 8 cubes by 8 cubes, so

Fill in the missing square numbers and do the sum.

See diagram of the bottom 10X10 layer:

John

My calculator said it, I believe it, that settles it

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