Find the hidden tiger in the given optical illusion ?

Which number should replace the question mark?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

What demands an answer, but asks no questions

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Count the number of triangles in the below picture?

What does this rebus riddle mean?