There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Count the number of lines in the image below ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

What can you hold in your right hand, but never in your left hand?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?