self Maths Puzzle

My Dad has a miniature Pyramid of Egypt. It is 6 inches in height. Dad was invited to display it at an exhibition. Dad felt it was too small and decided to build a scaled-up model of the Pyramid out of material whose density is (1 / 5) times the density of the material used for the miniature. He did a "back-of-the-envelope" calculation to check whether the model would be big enough.

If the mass (or weight) of the miniature and the scaled-up model are to be the same, how many inches in height will be the scaled-up Pyramid? Give your answer to two places of decimal.

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self Other Question

How many ways can you put 10 sweets into 3 bags so that each bag contains an odd number of sweets? Glenn and Jason each have a collection of tennis balls. Glenn said that if Jason would give him 8 of his balls they would have an equal number; but, if Glenn would give Jason 8 of his balls, Jason would have 3 times as many balls as Glenn. How many balls does Jason have?