book Maths Puzzle Numerical Ability

could you show me what a 8cm mass or circle would be equilivant to?

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book Other Question

find the ratio of the volume of a sphere to the area of a circle with the same radius. Simplify. im having trouble with this problem could u please help me the question is FIND THREE CONSECUTIVE EVEN INTEGERS SUCH THAT THE SUM OF THE SMALLEST AND THE LARGEST IS 36 if you can help me that would be great thanks!!.