Can you find out the remainder when 3^300 is divided by 5?

Using eight eights and addition only, can you make 1000?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Can you identify if it's a murder or a suicide ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Solve the puzzle by telling what does below picture means.

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

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 ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?