'Fifteen' in the Bible

You will cultivate the land for him -- you and your sons and your servants. You will bring its produce and it will be food for your master's grandson to eat. But Mephibosheth, your master's grandson, will be a regular guest at my table." (Now Ziba had fifteen sons and twenty servants.)

There were a thousand men from Benjamin with him, along with Ziba the servant of Saul's household, and with him his fifteen sons and twenty servants. They hurriedly crossed the Jordan within sight of the king.