Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Count the number of triangles in the given picture.

Why is the Hole below a Lock?

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

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Why is Saturday stronger than Monday?