Which was a result of the war of 1812

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom

this problem is a math riddle where in you need to solve a series of questions to get the answer. the following are the answers with their corresponding letter:

8 = n = 9 1/8

15 = t = 12 4/9

14 = i = 12 7/15

10 = h = 8 7/12

12 = c = 14 1/18

13 = k = 12 ½

11 = a = 9 5/8

6 = l = 14 1/10

5 = u = 6 3/8

7 = d = 6 ½

2 = e = 14 3/10

4 = o = 8 23/24

9 = t = 12 ¾

1 = h = 7 17/24

3 = c = 9 7/20

the answer is he couldn’t hack it.