Why do we preferably have round manhole covers and not square ones?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Can you solve the below geography rebus by decoding the below rebus ?

You can see it everyday, But cannot touch it at will. What is it?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?