'Fifty' in the Bible

What if there are fifty godly people in the city? Will you really wipe it out and not spare the place for the sake of the fifty godly people who are in it?

So the Lord replied, "If I find in the city of Sodom fifty godly people, I will spare the whole place for their sake."

what if there are five less than the fifty godly people? Will you destroy the whole city because five are lacking?" He replied, "I will not destroy it if I find forty-five there."