'Gallons' in the Bible

“For ten acres of vineyard will yield [only] one bath of wine,And a homer (six bushels) of seed will produce [only] one ephah of grain.”

He said, ‘A hundred measures of [olive] oil.’ And he said to him, ‘Take your bill, and sit down quickly and write fifty.’

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