There are forty elephants and they have forty-fore heads. How can this be possible?

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?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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 man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

Find the missing number in the sequence below:

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?