I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

I shave every day, but my beard stays the same. What am I?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Decode below rebus
D
N
A
T
S , D

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Which Travels Faster? Solve below famous picture riddle:

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?