Solve the alphametic puzzle by replacing the alphabet with the number.

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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.

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

What does this rebus puzzle means ?

Do you know who was buried in John's tomb?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

What always comes into a house through the keyhole?

Our product and our sum always give the same answer. Who are we?