book Maths Puzzle Numerical Ability

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?

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Find what the minimum surface area for a cylindrical can will be to hold {{{500cm^3}}}. Give the radius and height. The sum of 7 times a number and 7 divided by 2 is 14?