What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What came first, the chicken or the egg?

Can you find out the total number of triangles in the given figure?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

A father's child, a mother's child, yet no one's son.

Who am I?

What is harder to catch the faster you run?