Choose 10 points on a circle so 3 chords with endpoints among these 10 points never meet at a common point inside the circle. Of the different triangles that can be created by chords connecting pairs of these 10 points, how many have no vertex on the circle?

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?