Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

The more you take me, the more you leave me behind.
Who Am I?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Count the Triangle in the figure given below:

What English word has three consecutive double letters?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

If eleven plus two equals one, what does nine plus five equal?

What is the below Rebus indicate?