In the sequence K 8 A # 3 R T % E 6 M @ 5 U B 9 D & I 2 P 7, the letters taken in the order in which they stand are K, A, R, T, E, M, U, B, D, I, P. Add together the places in the English alphabet of the fourth and the ninth of these letters. Which letter stands at the place given by that total?

The fourth letter of the list is T, whose place is 20; the ninth is D, whose place is 4. Their total is 24, and the twenty-fourth letter is X. Counting the list from its right end instead gives B as the fourth and R as the ninth, a total of 20, which is T. Slipping one place along the list gives E and I, a total of 14, which is N. Taking B for the ninth letter, when B is in fact the eighth, gives 20 + 2 = 22, which is V.