book Maths Puzzle Numerical Ability

i have this problem but it's not in the book...

Find what the minimum surface area for a cylindrical can will be to hold {{{500cm^3}}}. Give the radius and height.

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book Other Question

simplify the following algebraic expression


(25x^3)^2/3 / (125xy^2)^1/3
If a triangular prism and a triangular pryamid have equal bases and equal altitudes, the volume of the prism is how many times the volume of the pyramid?