// source http://jsbin.com/viqiqenugi

index.html

<style id="jsbin-css">
height: 120px;
  width: 160px;
  background-color: blue;
  opacity: 0;
}

#pic {
  height: 120px;
  width: 160px;
  background-size: cover;
  background-image: url("http://bit.ly/1bm15nI");
}
</style>

<script id="jsbin-javascript">
var age = prompt("What is your age?");

// YOUR CODE HERE - Change the age variable's value so it's twice whatever the user entered


alert("Twice your age is " + );
</script>

<script id="jsbin-source-css" type="text/css">  height: 120px;
  width: 160px;
  background-color: blue;
  opacity: 0;
}

#pic {
  height: 120px;
  width: 160px;
  background-size: cover;
  background-image: url("http://bit.ly/1bm15nI");
}</script>

<script id="jsbin-source-javascript" type="text/javascript">var age = prompt("What is your age?");

// YOUR CODE HERE - Change the age variable's value so it's twice whatever the user entered


alert("Twice your age is " + );
</script>

jsbin.viqiqenugi.css

height: 120px;
  width: 160px;
  background-color: blue;
  opacity: 0;
}

#pic {
  height: 120px;
  width: 160px;
  background-size: cover;
  background-image: url("http://bit.ly/1bm15nI");
}

jsbin.viqiqenugi.js

var age = prompt("What is your age?");

// YOUR CODE HERE - Change the age variable's value so it's twice whatever the user entered


alert("Twice your age is " + );