What number comes next in this sequence:
7 8 5 5 3 4 4 _

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A man dies of old age on his 25 birthday. How is this possible?

I can write cow in 13 letters.

Can You?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Can you count the number of matches in the picture below ?

Which English verb becomes past tense just by rearranging the letters?

Find the next number in the series below

21 32 54 87 131 ?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?