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

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What country can make you shiver?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

A man dies of old age on his 25 birthday. How is this possible?

Can you solve below mathematical equation?

2^1234 - 2^1233

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

If eleven plus two equals one, what does nine plus five equal?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Rearrange the letters in "new door" to make one word.