Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What demands an answer, but asks no questions

I look at you, you look at me I raise my right, you raise your left. What am I?

How many triangles can you find in this given picture?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?