'Fifty' in the Bible

And this is the way you are to make it: it is to be three hundred cubits long, fifty cubits wide, and thirty cubits high.

And the waters were over the earth a hundred and fifty days.

And the waters went slowly back from the earth, and at the end of a hundred and fifty days the waters were lower.

And Noah went on living three hundred and fifty years after the great flow of waters;

all the years of his life were nine hundred and fifty: and he came to his end.

If by chance there are fifty upright men in the town, will you give the place to destruction and not have mercy on it because of the fifty upright men?

And the Lord said, If there are fifty upright men in the town, I will have mercy on it because of them.

If by chance there are five less than fifty upright men, will you give up all the town to destruction because of these five? And he said, I will not give it to destruction if there are forty-five.