Kayla and Alberto are selling fruit for a school fundraiser. Customers can buy small boxes of grapefruit and large boxes of grapefruit. Kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. Alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. What is the cost each of one small box of grapefruit and one large box of grapefruit?