JavaScript: Add Two Numbers

Number is a data type in JavaScript which represents numeric data.

Now let's try to add two numbers using JavaScript.

JavaScript uses the + symbol as an addition operator when placed between two numbers.

Example:

var myVar = 7 + 12 = 19;

Exercices

Change the ? so that sum will equal 20.

var sum = 10 + ?;
/* Your test output will go here.
*/