Why the output of this code is 48?

Question

var x = "2*2";
var y = 4;
var z = eval(x + y);
console.log(z);

the output is 48, but why?
I don't understand it.

Answer 1

"2*2"+4
Since x is a string and y is an integer, in JS it will add the y to x as a string type.
=> x+y = "2*2"+4 = "2*24" //Adds y to x as a string type.
So that when you use the eval function on x+y, it'll output 48 to the console.

Answer 2

How 48