IQ Brainteasers
1) You work in the grocery store of a strange neighborhood. In this neighborhood, there are two
types of people; one type always tells lies and the other type always tells the absolute truth.
One day, someone comes to your grocery. He looks like the honest type and he tells you: "I know
the next person who will come into the grocery. She is a female and she told me that she is a liar."
Do you believe that your next client is a liar?
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2) The residents of Country X has four digit phone numbers. Ms G. is moving to her new
apartment and has a new phone number. Normally Ms. G hates new phone numbers because she always
has trouble remembering her new number, but this time, Ms G actually likes her new number. Her
new phone number is very easy to remember:
1) The old number and the new number both have four digits
2) The new number is 4x the old number
3) The new number is the old number written in reverse.
What is Ms. G's new number?
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3)Someone has stolen a cookie from the cookie jar!!!
Suspects: a spider, a rat and a cat. The suspects say:
Spider: The rat ate the cookie
Rat: Yes I ate the cookie
Cat: I hate cookies and never eat them.
At least one of the suspects are lying and at least one of the suspects are telling the truth. Who ate the cookie?
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4)
A, B, C, D, E, F, G are 7 nurses. Each nurse has a day off every week, but no two nurse can be
off at the same day.
A's day off is a day after C.
D's day off is 2 days after E's day off.
B's day off is 3 days before G's day off.
F's day off is between B and
C's day-off and is on a Thursday.
What days of the week does each nurse has her day-off?
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5)
John and Henry are playing marbles…
John: I have more marbles than you.
Henry: I don't think so, let's count.
John: Ok, so you have more marbles than I do. But I am a better player. If I win three of your marbles, then I will have twice as much marbles as you do.
Henry: Let's try.
John: Alright. [The boys play marbles]
Henry: Didn't you say you are a better player. I am the winner this time!
John: You only won two marbles.
Henry: But now I have twice as much marbles as you do.
John: Let's play again.
Henry: ok. [Play marbles]
John: Lucky you this time.
Henry: Ha, you lost all your marbles now, and let's see how many marbles do I have now…
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