'Twenty' in the Bible

The Night VisionsOn the twenty-fourth day of the eleventh month, which is the month of Shebat, in the second year of Darius, the word of the Lord came to the prophet Zechariah son of Berechiah, son of Iddo:

And he said unto me, What seest thou? And I answered, I see a flying roll; the length thereof is twenty cubits, and the breadth thereof ten cubits.