def add(num1, num2):
    """
    Adds two numbers
    :param num1: (num) number 1 to add
    :param num2: (num) number 2 to add
    :return: (num) the sum of the two given numbers
    """
    return num1 + num2


def double(num):
    """
    Doubles the provided number
    :param num: (num) the number to double
    :return: (num) the provided number doubled
    """
    return 2 * num


def add_then_double(a, b):
    """
    Adds two numbers and then doubles the result
    :param a: (num) the first number to add
    :param b: (num) the second number to add
    :return: (num) the doubled summation of the two provided numbers
    """
    added = add(a, b)
    return double(added)
    # return doubled
    # could have also been written as one line:
    # return double(add(a,b))