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

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Which number should replace the question mark?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Why do people go to bed?

If 1+9+8=1, what is 2+8+9?

I cannot talk, but I always reply when spoken to. What am I?

Replace the question mark with the correct number in the below-given picture?

What is harder to catch the faster you run?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?