What has hands, but can’t clap?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

why number 8549176320 is one of a kind?

Who has married many women but was never married?

Can you replace the question mark with the correct number in the below table sequence?

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)?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?