Answers to Gospel Questions 3: 138-141; “Elias Is Noah…Summarizing the facts—Joseph Smith revealed that Gabriel was Noah; Luke declared that it was the angel Gabriel who appeared to Zacharias and Mary; and the Lord has declared that Elias appeared to Zacharias and Joseph Smith. Therefore, Elias is Noah.”
Holman Dictionary of the Bible; “The son of Lamech, a descendant of Adam in the line of Seth, and a survivor of the flood. A good and righteous man, Noah was the father of Shem, Ham, and Japheth who were born when he was 500 years old.”
Luke 1:17-19; “And he shall go before him in the spirit and power of Elias, to turn the hearts of the fathers to the children, and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord. 18 And Zacharias said unto the angel, Whereby shall I know this? for I am an old man, and my wife well stricken in years. 19 And the angel answering said unto him, I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to shew thee these glad tidings.”
I had to read the Mormon teaching above several times before I finally gave up and realized it’s impossible to figure it out. This is just another way to confuse the members.