#44 Average Quantitative Aptitude Question

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

A. 9

B. 17

C. 29

D. 295

Ans: A.Sol.
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.