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Ball Pyramid

Math brain teasers require computations to solve.

 

Puzzle ID:#4306
Fun:*** (2.31)
Difficulty:** (1.87)
Category:Math
Submitted By:mad-adeAhu***
Corrected By:SPUTNIK2

 

 

 



Mad Ade has built a pyramid out of old tennis balls. One side of the bottom layer of a triangular pyramid has 12 balls. How many are there in the whole pyramid?

Note that the pyramid is equilateral and solid.

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