John and Jessica are selling fruit for a school fundraiser. Customers can buy small boxes of tangerines and large boxes of tangerines. John sold 7 small boxes of tangerines and 13 large boxes of tangerines for a total $165. Jessica sold 1 small box of tangerines and 13 large boxes of tangerines for a total $135. What is the cost of each of one small box of tangerines and one large box of tangerines?