Below you will find the solution to the Fill In The Gap #1 puzzle.
E J ? T
The answer is O. Going through the alphabet, there are 4 letters between E and J. There are 4 letters between J and O, and there are 4 letters between O and T.
(E f g h i J k l m n O p q r s T)
5, 7, ? 17, 25
The answer is 11. The key is to look for a pattern within the sequence.
5 plus 2 equals 7
7 plus 4 equals 11
11 plus 6 equals 17
17 plus 8 equals 25
The pattern that leads to your solution is a series of even numbers starting with 2: 2,4,6,8
R N ? F
The answer is J. Going through the alphabet backwards, there are 3 letters between R and N. There are 3 letters between N and J, and there are 3 letters between J and F.
(R q p o N m l k J i h g F)