You can see it everyday, But cannot touch it at will. What is it?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

What is next number in the pattern below:

131 517 192 123 ?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Solve the following series:
AZ, GT, MN, __, YB

What Does this text mean:

important=important

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?