'Seventy five' in the Bible

So Abram went as LORD had spoken to him, and Lot went with him. And Abram was seventy-five years old when he departed out of Haran.

And these are the days of the years of Abraham's life which he lived, a hundred seventy-five years.

And the sons of Joseph, who were born to him in Egypt, were {nine (LXX)}souls. All the souls of the house of Jacob who came into Egypt, were {seventy-five (LXX/NT)}.