10+10 and 11+11 can give you the same answer.

Explain how?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

Can you count the number of triangles inside a triangle?

How can a man go eight days without sleep?

What word is pronounced the same if you take away four of its five letters?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?