Mary, Edna, and Lucy are athletes who train every Saturday. Mary ran 3/8 of a 24-kilometer field on one Saturday. Edna ran 2/3 of the distance of Edna, and Lucy ran 5/6 of the distance of Edna. How many more kilometers should Lucy run to cover the same distance as Mary? Let's think first. Chain of thought:
Mary ran 3 / 8 x 24 = 9 kilometers. Edna ran 2 / 3 x 9 = 6 kilometers. Lucy ran 5 / 6 x 6 = 5 kilometers. Lucy should run 9 - 5 = 4 kilometers more.
Therefore, the answer is 4.