self Maths Puzzle

How many ways can you put 10 sweets into 3 bags so that each bag contains an odd number of sweets?

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self Other Question

One of 27 otherwise identical balls is overweight. How can it be identified after 3 weighings with an old balance? 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.