Average of non-zero number and its square is 5 times the number. The number is ____ ?

– by 0

A. 5
B. 9
C. 17
D. 65

(x + x2)/2 = 5x => x2 – 9x = 0
=> x(x – 9) = 0
=> x = 0 or x = 9
So, the number is 9

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