Question

If the average of `x` and `3x` is `12`, what is the value of `x`?

Answer 1

6

Explanation:

The average is the sum divided by the number of items.
`(x+3x)/2 = 12`
Multiply both sides by 2 to get `x+3x=2*12`.
Simplify to get `4x=24`.
Divide both sides by 4 to get `x=6`.