'Thirty' in the Bible

And he brought me into the outer court, and behold, there were cells, and a pavement made for the court round about: thirty cells were upon the pavement.

And the side-chambers were three, chamber over chamber, and thirty in order; and they entered into the wall which the house had for the side-chambers round about, that they might have hold; but they had not hold in the wall of the house.

In the four corners of the court there were enclosed courts, forty cubits long and thirty broad: these four corner courts were of one measure.