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?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

What has one eye, but can’t see?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

It belongs to you, but other people use it more than you do. What is it?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?