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

Find the hidden tiger in the given optical illusion ?

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.)

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

One fine day, an intellectual man came to the emperor's court with the aim of testing Birbal's wittiness. In order to do this, he challenged Birbal to answer his question and hence prove that he was as intelligent and witty as he was said to be.
He asked Birbal, Do you want me to ask one difficult question or a hundred easy ones?
Since both Akbar and Birbal had had a tough day and were eager to leave, Birbal hastily told the intellectual to ask him a single difficult question.
Intellectual: OK. Tell me what came first into the world, the egg or the chicken?
Of course, the chicken, Birbal replied with a smile.
This time with a note of victory in his voice, the intellectual asked Birbal, How will you demonstrate that?
What did Birbal say?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you solve the maths in the below-given picture equation?

What has many keys but can’t open a single lock?