A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

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?

What does this mathematical rebus means ?

What demands an answer, but asks no questions

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What jumps when it walks and sits when it stands?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

You need to arrange three 7 and mathematical symbols to form number 1?