Puzzles - Missing letters puzzles

The sum of the numerical values of the letters in each column of the diagram equals 29.

The sum of the numerical values of the letters in opposite segments of the circle equals 26.

Start with the letter J in the top left square, and move clockwise around the other squares. Letters follow the alphabetic sequence, skipping 4 letters at a time. Start with the X in the inner square in the top left, and move clockwise. These inner letters also follow the alphabetic sequence, skipping 5 letters at a time.