A student group can clean 1.2 acres of land in 3 hours. The group volunteers to
clean a 3-acre park. The group cleans land
at a constant rate.

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.