exam Maths Puzzle Numerical Ability

when you first walk into weaver there are 2 large regular octogonal pillars. the edges are 6.5 and they are 9 feet tall. how much granite was needed to build these pillars??

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A total of $34000 was invested in two parts, one part at an interest of 20% and the other part at an interest of 15%. The amount invested at 20% invest was $500 more than the amount invested at 15% interest. Find the amount invested in each part. On the blueprint of Lauren's new office building, the scale is 3 in. equals 8 ft. What will be the actual length of Lauren's office if it measures 6 in. long on the blueprint?