exam Maths Puzzle Numerical Ability

I am a composite number between 20 and 30.The sum of my prime factors is the greastes of all the composites between 20 and 30.What number am i??

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Hi! Could someone please help me to simplify (all exponents should be positive)

4x^3*(3y)^4

and

(2^-1a^2b)^-3
----------------
4a^-9

Thanks so much for the help!
-3x = 27