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Question

The average of a non-zero number and its square is 5 times the number. The number is


A

3

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B

6

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C

9

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D

12

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Solution

The correct option is C

9


Let the number be x. Then,

(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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