There were 90 runners to start a race. In the first half of the race, 1/3 of them dropped out. In the second half of the race, 1/5 of the remaining runners dropped out. How many runners finished the race?
After the first half, 2/3 of the runners were still in the race. After the second half, 4/5 of those were still in the race. The number of finishers was ...
(4/5)(2/3)(90) = 48 . . . runners finished the race
