Which number should replace the question mark?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

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?

It belongs to you, but other people use it more than you do. What is it?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Which English verb becomes past tense just by rearranging the letters?

What word begins and ends with an E, but has only one letter?

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?