'Fifteen' in the Bible

and thou hast served for him the land, thou and thy sons, and thy servants, and hast brought in, and there hath been to the son of thy lord bread, and he hath eaten it; and Mephibosheth son of thy lord doth eat continually bread at my table;' and Ziba hath fifteen sons and twenty servants.

and a thousand men are with him from Benjamin, and Ziba servant of the house of Saul, and his fifteen sons and his twenty servants with him, and they have gone prosperously over the Jordan before the king.