book Maths Puzzle Numerical Ability

i am having problem with functions, like input and output problem can you keep.
please help A.S.A.P

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Variations
The area of a circle varies directly as the square of the length of its diameter. What is the constant variation?
Thank you If the average arithmetic mean of 8, 12, 15, 21, x and 11 is 17 then what is x?