Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does a man do only once in his lifetime, but women do once a year after they are 29?

What word begins and ends with an E, but has only one letter?

Can you count the number of matches in the picture below ?

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

What does this Rebus Picture means ?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?

If 1+9+8=1, what is 2+8+9?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?