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Puzzles and Brain Teasers

Brain teasers and puzzles help you to train your brain. So go ahead, take our Brain Teaser. And don't take a peek at the answer until you have tried really hard.

Brain Teasers and Puzzles

Fill in the blanks:
B   C   D   ?   F   H   ?   K   L   M   N   ?   Q

Answer  Click here for Answer

G, J and P

 
Fill in the sequence:
5   6   9   15   ?   40

Answer  Click here for Answer

 
Can you make half of 12 into 7?

Answer  Click here for Answer

Cut the bottom half of roman XII.

 
Imagine you are alone in a boat in the middle of a river. Suddenly the boat starts to sink. You don't know swimming and no one is around to help you. How do you get out of the situation?

Answer  Click here for Answer

Stop imagining.

 
Fill in the blanks:
3   3   5   4   4   ?   5

Answer  Click here for Answer

3

Number of letters in one, two, three, four, five, six, seven and so on.

 
Fill in the sequence:
99   92   86   ?   77

Answer  Click here for Answer

81

99 - 7 = 92
92 - 6 = 86
86 - 5 = 81
81 - 4 = 77

 
In a class test Tony scored 160 marks in Geography and History together. If one third of his marks in Geography equals to half of the marks he scored in History, then how much has he scored in History?

Answer  Click here for Answer

64

Let the marks in Geography be G and History be H.
Eq 1: G + H = 160
Eq 2: G/3 = H/2
By the problem:
G = 160 - H

Therefore, putting the value of G in Eq 2:
(160 - H)/3 = H/2
or, 320 - 2H = 3H
or, 3H + 2H = 320
or, 5H = 320
or, H = 64

 
Fill in the sequence:
8   15   44   175   874   ?

Answer  Click here for Answer

5243

9 x 1 - 1 =  8
8 x 2 - 1 = 15
15 x 3 - 1 = 44
44 x 4 - 1 = 175
175 x 5 - 1 = 874
874 x 6 - 1 = 5243

 
If SOIL is written as $4%6 and DISK is written as 5%$#, then how will you write SOLID?

Answer  Click here for Answer

$46%5

 
While introducing the picture of a woman to a guest, Sam said she is the daughter of Sam's mother's brother's only brother-in-law. What is the relation between Sam and the woman?

Answer  Click here for Answer

The woman is Sam's sister.

Sam's mother's brother's only brother-in-law is Sam's father. Hence, the daughter of Sam's father, is Sam's sister.

 
Fill in the sequence:
1   4   6   9   11   14   16   19   ?

Answer  Click here for Answer

21

Each number is the sum of the previous number and "2" or "3" alternatively. Please see below:
1 + 3 = 4
4 + 2 = 6
6 + 3 = 9
9 + 2 = 11
11 + 3 = 14
14 + 2 = 16
16 + 3 = 19
19 + 2 = 21

 
Make a sentence consisting of three words that have the whole alphabet.

Answer  Click here for Answer

The whole alphabet.

 
Turn IX into 6 without lifting your pen.

Answer  Click here for Answer

Write S in front of IX to make it SIX.

 
You have two buckets, one of 4 liters and the other of 3 liters. Get 2 liters of water from a well using only these two buckets.
(It is not possible to partially fill a bucket and determine the amount of water in it)

Answer  Click here for Answer

Fill the 3 liter bucket and then pour the entire water into the 4 liter bucket.
The 4 liter bucket should still be able to hold 1 liter more.
Now again fill the 3 liter bucket and empty it into the 4 liter bucket till it becomes full.
Since the 4 liter bucket had space for only 1 more liter, the 3 liter bucket would now have 2 liters of water in it.

 
A doctor gives you 5 pills and instructs you to take each at intervals of half an hour. How long will the pills last?

Answer  Click here for Answer

2 hours

You take the first pill at 10:00am
The second pill at 10:30am
The third pill at 11:00am
The fourth pill at 11:30am
The fifth pill at 12 noon

 
Complete the series.
1   1   2   3   5   8   13   ?

Answer  Click here for Answer

21

Each number is the sum of the previous two digits.

 
Tony is 9 yrs old. After 20 years of Tony's birth what will be double of the sum of the ages of Tony's cousin, who is currently 12 years old, and Tony's sister, who is presently 14 years old?

Answer  Click here for Answer

96

20 years after Tony's birth would mean 11 years from now (since Tony is already 9 years old).
Hence, 11 years from now, Tony's cousin would be 12 + 11 = 23 years old.
Similarly, 11 years from now, Tony's sister would be 14 + 11 = 25 years old.
Hence sum of the ages of Tony's cousin and Tony's sister would be 23 + 25 = 48.
And double of that sum would be: 48 x 2 = 96.

 
Complete the series.
18   24   28   30   ?

Answer  Click here for Answer

30

2 x 9 = 18
3 x 8 = 24
4 x 7 = 28
5 x 6 = 30
6 x 5 = 30

 
What is the largest number you can get using only 2 digits?

Answer  Click here for Answer

387420489 (i.e. 99)

 
Fill in the blank:
8   2   6
4   ?   0
6   0   6

Answer  Click here for Answer

4

8-2 = 6
4-4 = 0
6-0 = 6

 
After three years Sam's teacher will be six times older than Sam was last year. The sum of Sam and his teacher's current age is 68. What will be their ages after five years?

Answer  Click here for Answer

Sam will be 16 years and his teacher will be 62 years.

 
What's the missing letter?
J ? M A M J J A S O N D

Answer  Click here for Answer

F

The letters are the first letter of each of the twelve months. The second month is February.

 
Johnny is taller than Kitty and Carol. Kitty is taller than Sam. Kitty and Sam are taller than Nancy. Sam is shorter than Carol. Who is the shortest?

Answer  Click here for Answer

Nancy

 
Make 1000 using eight 8's. You can only use addition.

Answer  Click here for Answer

888+88+8+8+8 = 1000

 
Place a mathematical symbol between 3 & 7 to get a number which is greater than 3 but lesser than 7.

Answer  Click here for Answer

3.7

Add a decimal between 3 and 7.

 
Complete the sequence:
Z   O   T   T   F   F   S   S   __

Answer  Click here for Answer

E

The sequence is Zero, One, Two, Three, Four, Five, Six, Seven, Eight

 
Complete the sequence:
2   3   3   5   10   13   39   43   __

Answer  Click here for Answer

172

Add 1 to get the next number then multiply with 1 for the next one. Similarly add 2 and then again multiply with 2 and so on.

 
Complete the sequence:
P   O   I   U   Y   T   ___

Answer  Click here for Answer

R

 
Complete the sequence:
101   99   102   98   103   97   ___   ___

Answer  Click here for Answer

104, 96

 
Cut a circular cake into 7 pieces with 3 cuts.

Answer  Click here for Answer

 
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