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Quantitative Aptitude

Averages

The average o...

Question

The average of a non-zero number and its square is 7 times the number. Find the number.

A

9

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B

7

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C

8

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D

6

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E

13

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Solution

The correct option is E 13
$\frac{n + n^{2}}{2} = 7 n \Rightarrow n^{2} = 13 n \Rightarrow n = 13$

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