Hint
Look at the letter positions in the alphabet.
Answer
R.
If you take the alphabetic positions of each letter in a row, the total is always 56.
Double-Checking
Y + G + W + A = 25 + 7 + 23 + 1 = 56
K + L + R + O = 11 + 12 + 18 + 15 = 56
Z + J + P + D = 26 + 10 + 16 + 4 = 56
V + F + T + H = 22 + 6 + 20 + 8 = 56
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Puzzle 2
Imagine a bottle recycling skip, empty other than one lonely bottle.
Every hour, on the hour, people come and put bottles into the skip.
The first hour, at noon, one person came and put a bottle in.
One hour later, two people each placed a bottle into the skip.
An hour later, four people each placed a bottle into the skip.
This doubling of people continued until 11pm, when the skip was finally full.
While captive in the tower, King James wrote an entire book.
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Puzzle 4
At last week's Girl Guide's picnic, four girls were tucking into their packed lunches. Jane had muffins but Denise didn't have orange juice. The girl who had blackcurrant juice also had scones and Frankie had blueberry juice. The girl who had cake also had strawberry juice, whereas Alice didn't have the strawberry juice nor toast. Can you work out who had which drink and which dessert?
Answer
Alice had blackcurrant juice and scones.
Jane had orange juice and muffins.
Denise had strawberry juice and cake.
Frankie had blueberry juice and toast.