Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

What does the below rebus riddle means?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?