'Twenty' in the Bible

Or what king, when he sets out to meet another king in battle, will not first sit down and consider whether he is strong enough with ten thousand men to encounter the one coming against him with twenty thousand?

Now there were six stone waterpots set there for the Jewish custom of purification, containing twenty or thirty gallons each.

At this time Peter stood up in the midst of the brethren (a gathering of about one hundred and twenty persons was there together), and said,

They took soundings and found it to be twenty fathoms; and a little farther on they took another sounding and found it to be fifteen fathoms.