Average Practice Test 4

Question : 4 of 40

Marks: +1, -0

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

Solution:

Let the number be x
Then

{x+x^2}/2=5x

⇒x^2-9x=0

⇒x(x-9)=0

Either x = 0 (Impossible) or, x = 9
Hence, number = 9

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