BrainDen.com - Brain Teasers

# Utkrisht123

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2. ## How many oranges are there?

A boy sells oranges from door to door. One day while on his rounds he sold 1/2 an orange more than half his orange to the first customer. To the second customer he sold 1/2 an orange more than half of the remainder and to the third and last customer he sold 1/2 an orange more than half she now had, leaving her none. Can you tell the number of oranges he originally had? Oh by the way he never had to cut an orange

1. The world will end as infinite amount of energy will release (Big bang). Or Infinte amount of heat or energy transfer will take place. 2.No. 3.Yes I accept the mission of never the accept the mission. 4.This explains why time travelling is not possible. 5.Less than 0° In my opinion "twice as cold" doesn't mean "twice the temperature" as sometimes it will increase the temperature making it less colder. eg 32°F will give 64°F 6.This one is really confusing. 7. Headlight will break. or Headlight will glow but no one will able to see its light. 8. I have to think on this one.
4. ## Funny Equation

In a classroom of standard of VIII somebody wrote an equation on a blackboard ; to the left of the equal sign is one symbol, and to the right three symbols. A boy remarked that if the symbol to the left of the equal sign were inverted and one of the three symbols to the right were erased, the equation would still be true and it contains no redundant or unnecessary symbols. What is the equation? (The line in a fraction counts as a symbol)
5. ## The Conscientious Driver

Mr. D always followed the advice to conserve energy as he was a conscientious driver. While driving his family Ford one day, he came to a stop sign and noticed that the odometer showed 25952 miles. Observant as he was he recognised that the number was a palindrome. He thought that it will be a long time before a palindromic number happens again. Yet two hours later when he arrived home the odometer showed a new palindrome number. What was the new palindrome number, and how fast was he travelling in those two hours?
6. ## Interview Question

In an interview, the interviewer asked a candidate about a four digit number whose first two as well as last two digits are perfect squares. The conversations between the interviewer and the candidate are as follows Interviewer : Can you tell me what number I am thinking of ? Candidate : No I am not sure. Interviewer : There are no zeroes in the number. Candidate : I am still not sure Interviewer : There is no repetition of digits. Candidate : Sorry, I am not sure even now. Interviewer : OK the sum of digits is a prime number. Candidate : Sorry. Interviewer : The first two digit number is bigger than the last two digit number. And no digit is 5. If you still don't know then I am sorry you may leave the room. Candidate : Yes sir, now I know the number. Can you tell what the number is ?
7. ## One Girl - One Boy

Shouldn't it be a 1/2 as one child is a girl and that another child can be a boy or a girl.
8. ## What is better - eternal bliss or a simple bread?

This is same thing as Which is greater no mounatin or Mount Everest?
9. ## Crocodile Sophism

The mother should say "You will eat my child"
10. ## Power of 0

I always wonder what is 00? Is it 0, 1 or not defined or infinity
11. ## Triogical level 50

I need help in level 50 of triogical
12. ## A game

A and B played a game with some amount. They agreed that whoever will lose have to give half his amount to the winner. They played 100 games and a result was that A won First game B won next two games A won next three games and so on A B B A A A B B B B A A A A A............... Who will have graeter amount after the 100th game?
13. ## a^2 -b^2 = (a+b)(a-b)

All of you know that a2 - b2 = (a+b)(a-b) I know only two method to prove it. a2 - b2 a2 - b2 a2 - b2 + ab - ab a2 - b2 + 2ab -2ab -2b2 a2 + ab - ab - b2 (a+b)2 - 2b(a+b) a(a+b) - b(a+b) (a+b)(a+b) - 2b(a+b) (a-b)(a+b) (a+b)(a+b-2b) (a+b)(a-b) Apart form these two method are there any other method to prove it.
14. ## Perfect number

1 has only 1 as a factor so sum is 1
15. ## Perfect number

Perfect numbers are number whose sum of factors are twice the number itself. Example 1. 6 factors of 6 are 1,2,3 and 6 sum=12 i.e 2 * 6 2. 28 factors 1,2,4,7,14,28 sum=56 i.e 2 * 28 can you tell any other perfect no?
16. ## Number game 2

Look at this pair 42 24 ( digits of 42 are interchanged i.e =24) x 48 x 84 (digits of 48 are interchanged i.e = 84) -------- ---------- 2016 2016 When the digit of multiplicand and multiplier are interchanged then also the result is same. How many such pair can you find?
17. ## Number game 1

Good can you find one more to get marked as best answer because there is one more competitor. First one to give one more solution will be marked best answer
18. ## Number game 1

Good can you find one more to get marked as best answer because there is one more competitor.
19. ## Number game 1

There is one solution in which you don't have to turn 6 into 9 or 9 into 6 The one who will give me that answer will be marked as best answer So common guys give it a try
20. ## Number game 1

1 2 3 4 5 6 7 8 9 Arrange these numbers into two separate groups so that they add up to same total. Note : you cant turn 9 upside down and make it 6
21. ## A chessboard

If you want to then You are welcome to do so
22. ## A chessboard

Good point. i didnt thought that way But if I say that all rectangles should be completely aligned and should be of same size then what would you say.
23. ## A series

7, 63, 215, 513, 999 Carefully observe the pattern of series and tell a) Which no. is incorrect in the above series? b) What will be the correct no in that place? c) What will be the next two numbers in the above series?
24. ## A chessboard

Two diagonally opposite corner squares are removed from a regular chessboard. Now is it possible to cover all 62 squares with exactly 31 rectangles ( no rectangle should overlap each other ). If yes then how? If no then why?
25. ## logic logic

Its the faces
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