Can you place six X (crosses) in below board without making three in a row in any way ?

What number divided by 4 is the same as that number minus 4?

What is the centre of gravity?

The answer I give is yes, but what I mean is no. What was the question?

How many sides does a circle have?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?