chelsea and shawna are selling cheesecakes for a school fundraiser. customers can buy french silk cheesecakes and apple cheesecakes. chelsea sold 2 french silk cheescakes and 3 apple cheesecakes for a total of $20. shawn sold 5 french silk cheescakes and 3 apple cheesecakes for a total of $32. find the cost of one french silk cheesecake and one apple cheesecake.