Consider the series: 5 G T 2 % 7 J K 9 B & M 4 R 8 D. If all sixteen elements are written out in the reverse order, which element then stands sixth from the left end?

Written backwards the series reads D 8 R 4 M & B 9 K J 7 % 2 T G 5, whose sixth element is &. The same answer follows without rewriting anything: the sixth from the left of the reversed series is the sixth from the right of the original, at place 16 − 6 + 1 = 11, which is &. M and B stand fifth and seventh in the reversed series and are the one-place slips; 7 is the sixth element of the original series, chosen by forgetting to reverse at all.