Puzzles - Missing letters puzzles

Answer

:

S

Explanation

:

Starting at the top left of the diagram, and moving in a Z shape, letters advance through the alphabet in steps of 5.

Answer

:

Y

Explanation

:

Start with the top point of each star, and move clockwise around the other points. Letters advance through the alphabet in steps of 5 for the left hand star, 6 for the central star, and 7 for the right hand star.

Answer

:

Q

Explanation

:

Working in columns, add the numerical value of the top and middle letters together to give the numerical value of the lower letter.