def build_tuple_for_feet_structure(quantity):
    """
    Builds the tuple required to create a FeetAndInches object
    :param quantity: string containing the feet, inches, and fractional inches
    :return: tuple containing feet, inches, and calculated fractional inches
    """
    feet = float(quantity[0])
    inches = float(quantity[1])
    fractional_inches = quantity[2].split('/')
    return feet, inches, int(fractional_inches[0])/int(fractional_inches[1])