'Fifteen' in the Bible

And you and your sons and your servants are to take care of the land for him, and get in the fruit of it, so that your master's son may have food: but Mephibosheth, your master's son, will have a place at my table at all times. Now Ziba had fifteen sons and twenty servants.

And with him a thousand men of Benjamin, and Ziba, the servant of Saul, with his fifteen sons and twenty servants, came rushing to Jordan before the king,