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 = ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Which Travels Faster? Solve below famous picture riddle:

With the help clues provided in the image, can you find the 5 digit key?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?