What is the average (arithmetic mean) height of the n people of a certain group?
(1) Height of the tallest person in the group is 6 feet 2.5 inches and the average height of the rest of the people in the group is 5 feet 10 inches
(2) The sum of the heights of the n people is 178 feet 9 inches
Boxes that are 12 inches tall are being stacked next to boxes that are 18 inches tall. What is the shortest height at which the two stacks will be of same height?