Replace the question mark with the correct number.

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 makes this number unique: 8,549,176,320?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Can you make four (4) nines (9) equal 100?

Find the next number in the series below

21 32 54 87 131 ?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

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

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
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There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?