'Fifteen' in the Bible

And thou, and thy sons, and thy servants, shall till the land for him, and thou shalt bring in the fruits, that thy master's son may have food to eat. And Mephibosheth thy master's son shall eat bread at my table continually. Now Ziba had fifteen sons and twenty servants.

And there were a thousand men of Benjamin with him, and Ziba the servant of the house of Saul, and his fifteen sons and his twenty servants with him; and they forded the Jordan before the king.