Set of logical problems

Question

I have set of logical problems, I hope you guys would help me with some solutions. Thanks in advance.
The first one is:
2 - 3 - E - 6 - 2 - H - 3 - 6 - I - 4 - ? - L
What's the value of ?
2nd question:
C++ walks faster than Python, Java walks slower than C++. Who walks faster? Python or Java?
3rd question:
Although James answered 10 questions incorrectly, he got 12 out of 20 (12/20) on a test. If he receives the same number of points for each question answered correctly, how many questions were asked?

Answer 1

2+3 = 5 => E (5th alphabet)
6+2 = 8 => H (8th alphabet)
3+6 = 9 => I (9th alphabet)
4+8 = 12 => L (12th alphabet)

Answer 2

25 questions were asked.
Reason : 12/20 = 0.6 score means 60% are correct and 40% are incorrect. If 10 questions are 40%, 25 questions are 100%.

Answer 3

Q.2) Can't be determined.

Answer 4

@Wisdom : You're welcome. And, don't call me "Sir". I am very comfortable with "Krishna".

Answer 5

8. Should I mention the reason too?

Answer 6

@Sir, please I just updated the question. Thanks

Answer 7

Thank you so much Sir Krishna. I thought as much.

Answer 8

Sir, that's what you deserve.

Answer 9

I just added the last question.

Answer 10

@Sir Krishna, I'll be happy if you could give the reason.

Answer 11

Wow! May God bless you @sir Krishna