exam Maths Puzzle Numerical Ability

Find the missing geometric sequence 15, __ , 81,...
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Find the missing geometric sequence 36, __ , 100, ...
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exam Other Question
Give an example of a number that is a rational number, but not an integer. I am finding partial decomposition very intimidating-Please help if you can:)Thank You very much!
Find the unknowns on the right side of the partial fraction decomposition.
x+3/x^3+64=A/x=4+Bx+C/x^2-4x+16