If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

I cannot talk, but I always reply when spoken to. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

What has no start, end, or centre?

O_er_t_o_

Complete the missing letters of the given word.

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Rose, Lily and Jasmine decided to buy flowers for their moms on Mother's Day. One of them bought lilies, the other roses, and the third one jasmines.
'It's funny!' said the girl with roses, 'we bought roses, jasmines and lilies, but none of us bought the flowers matching her name'.
'You're right!', said Lily.
What kind of flowers did each of the girls buy?

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

What makes this number unique: 8,549,176,320?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?