Why don't all the quantities add up and come out separately?

Question

fun main(args: Array<String>) {
var arr = arrayOf(1, 3, 5)
var x=0
arr.forEach {
x+= it *4
println(x)
}

Answer 1

put println(x) outside after loop..

Answer 2

Thanks 💖

Answer 3

I want the 3 quantities to be added at the end