How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

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 ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

Why do we preferably have round manhole covers and not square ones?

What's the only room from which no one can enter or leave

There was a strange boy who was born before his father. How can this be possible?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Replace the question mark with the correct number in below Picture: