I have three `div` that contain a number.

```
<div class="a">10</div> 
<div class="b">20</div>
<div class="c">30</div>

```

I get the number inside each one with jQuery `.html()`.

```
var val_1 = $('.a').html(), 
    val_2 = $('.b').html(),
    val_3 = $('.c').html();

```

How can I sum them?

This do not work as expected:

```
var total = val_1 + val_2 + val_3;

```

Since returned 102030, when I expected 60.