Aceramics workshop makes wreaths, trees, and sleighs for sale at christmas. a wreath takes 3 hours to prepare, 2 hours to paint, and 9 hours to fire. a tree takes 15 hours to prepare, 3 hours to paint, and 4 hours to fire. a sleigh takes 4 hours to prepare, 17 hours to paint, and 7 hours to fire. if the workshop has 108 hours for preparation time, 80 hours for painting, and 104 hours for firing, how many of each can be made?