The more of this there is, the less you see. What is it?

Why is the Hole below a Lock?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

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

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Count the number of triangles in the picture below:

A man is walking down a road with a basket of eggs. As he
is walking he meets someone who buys one-half of his eggs
plus one-half of an egg.
He walks a little further and meets another person who buys
one-half of his eggs plus one-half of an egg.
After proceeding further he meets another person who buys
one-half of his eggs plus one half an egg. At this point, he
has sold all of his eggs, and he never broke an egg.
How many eggs did the man have to start with?

No matter how little or how much you use me, you change me every month. What am I?

In the four images below, can you find the odd one out?

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?