Pineapple Surprise Cake
["1 box yellow Duncan Hines cake mix", "1 large can pineapple and syrup", "1 small can mandarin oranges, drained and cut", "3 eggs", "2/3 c. oil"]
["Mix by hand and pour into a 13 x 9-inch pan.", "Bake at 350\u00b0 for 35 to 40 minutes."]
["cake mix", "pineapple", "mandarin oranges", "eggs", "oil"]