Which letter of the English alphabet lies exactly midway between the fifth letter from the left end of the alphabet and the eighth letter from the right end?

The fifth letter from the left is E, at place 5. The eighth from the right is at place 26 − 8 + 1 = 19, which is S. The place midway between them is (5 + 19) ÷ 2 = 12, and the twelfth letter is L. Taking the eighth from the right to be at place 18 gives a midpoint of 11, which is K; taking it to be at place 20 gives 12.5, rounded up to M; and counting the fifth from the left as D, at place 4, gives a midpoint near 11.5 and so J or K.