Can you find a number that lies one third of the distance between 1/3 and 2/3?

O_er_t_o_

Complete the missing letters of the given word.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

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

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Rearrange the letters in "new door" to make one word.

John was piloting a plane behind a car but was never able to overtake it. Why?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?