Question

The average of 8,6,9,12 and 4x is x. What is the value of x

Answer 1

8 + 6 + 9 + 12 + 4x / 5 = x Original Problem.
25 + 4x / 5 = x Addition.
25 + 4x = 5x Multiply each side by 5.
25 = x Subtract 4x from each side.
x = 25 Switch equation around.

Answer: x = 25

Answer 2

35

Explanation:

The average of 8,6,9,12 and 4x is x

To get average add all the numbers given in data set and divide by 5 because we have 5 numbers in data set

Average =
`(8+6+9+12+4x)/(5)`

Given that average is x. So we replace x for average

`x=(8+6+9+12+4x)/(5)`

Multiply both sides by 5

`5x= 8+6+9+12+4x`

Subtract 4x from both sides

`x= 8+6+9+12`

`x=35`

So the value of x is 35