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

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

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?

Give it food and it will live; give it water and it will die.

I travel all around the world but always stay in the corner. What am I?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What does an Island and the letter T have in common?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

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?