'Fifty' in the Bible

And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.

And the waters prevailed upon the earth an hundred and fifty days.

And the waters returned from off the earth continually: and after the end of the hundred and fifty days the waters were abated.

And Noah lived after the flood three hundred and fifty years.

And all the days of Noah were nine hundred and fifty years: and he died.

Peradventure there be fifty righteous within the city: wilt thou also destroy and not spare the place for the fifty righteous that are therein?

And the LORD said, If I find in Sodom fifty righteous within the city, then I will spare all the place for their sakes.

Peradventure there shall lack five of the fifty righteous: wilt thou destroy all the city for lack of five? And he said, If I find there forty and five, I will not destroy it.