Random Puzzles 

Workings

Hint
What day of the week was the 1^st?

Answer
Saturday.

Reasoning
For a 31-day month, such as March, to have 5 Saturdays and 5 Mondays the 1^st must be a Saturday (and the 31^st a Monday).

You can then work forwards from the 1^st.

Workings

Hint
Where do they each grow?

Answer
Potato.

This is the only one that grows underground.

Workings

Hint
The first answer is Aaron.

Answer
rn   = Aaron or Ernie or Ron
jms  = James
kvn  = Kevin
smn  = Simon
kth  = Keith
jrmh = Jeremiah

Workings

Hint
Can Q1's answer be A?

Answers
1. D
2. C
3. B
4. A

Reasoning
The easiest way to solve this puzzle is to use Q1 to check the logic.

If Q1's answer was A, this tells us that Q2's answer is B, which tells us Q3's is D, which tells us Q4's answer is B, which tells us Q1's answer is C. A contradiction.

If Q1's answer was B, this tells us that Q2's answer is A, which tells us Q3's is C, which tells us Q4's answer is C, which tells us Q1's answer is A. A contradiction.

If Q1's answer was C, this tells us that Q2's answer is D, which tells us Q3's is A, which tells us Q4's answer is D, which tells us Q1's answer is B. A contradiction.

If Q1's answer was D, this tells us that Q2's answer is C, which tells us Q3's is B, which tells us Q4's answer is A, which tells us Q1's answer is D. Which is correct, and therefore the correct answer.