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

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Who always enjoys poor health?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

Count the squares in the matchstick puzzle below?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What is both possible and impossible at the same time?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Can you write down eight eights so that they add up to one thousand?