What is so fragile that saying its name breaks it?

You need to arrange three 7 and mathematical symbols to form number 1?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

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

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

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

In which direction should the missing arrow point?

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.