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

Which five letter word can be added at the end of below word to form a
valid word?

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It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

What you cannot hold but it is yours?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1