If eleven plus two equals one, what does nine plus five equal?

What has one letter and starts with an E?

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

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Can you place six X (crosses) in below board without making three in a row in any way ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

When is the top of a mountain similar to a savings account?

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