Mr. stevens bought 8 liters of soda for a party. his friends drank 1 liter. what fraction of the soda did his guests drink? what fraction of the soda was left?

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.