Maths Riddles, Puzzles and Brain Teasers
Mathematics Riddles, Puzzles and Brain Teasers with answers, Tricky maths riddles and number puzzles that challenges your brain power, challenging maths riddles.
Riddle No 1
1) If we hit a stone once then it is divided into two pieces.
Then what is the number of pieces if we hit the stone for 4 times.
2) Suppose you are given a 30 m cloth and you are asked to cut
1 m everyday from it . In how many days you completely cut the whole piece of
cloth.
Riddle No 3
3) You are given 9 boxes and you have to write the digits from
1 to 9 in these boxes. Digits are placed in such a way so that we get a total
of 15 in all directions. Repetition of the digit is not allowed.
Riddle No 4
4) You are given 9 boxes and you have to write the digits from
8 to 16 in these boxes. Digits are placed in such a way so that we get a total
of 36 in all directions. Repetition of the digits is not allowed.
Riddle No 5
5) Write a number of 9
digits which contains all digits from 1 to 9 in such a way so that it satisfy
the following conditions.
 The 9 digit number should be divisible by 9.
 If we remove the left most digit then the remaining number
should be divisible by 8.
 Again, If we remove the left most digit then the remaining
number should be divisible by 7.
 Again, If we remove the left most digit then the remaining
number should be divisible by 6.
 Continue this process so that in the last step the digit is divisible by 1.
Riddle No 6
By which number we multiply 152207 so that the resulting
number 11111111
Add 8 times 8 in such a way so that the result is 1000.
Riddle No 8
In a counting from 1 to 100 how many 5’s are there.
There are three bottles of capacity 8 litre, 5 litre, 3
litre. Bottle of capacity 8 litre is full of milk. It is equally divided into
two bottles in 8 litre and in 5 litre.
There is no other source of measurement, solve the problem and you can make use
of 3 litre bottle.
SOLUTION

Capacity

8 Litre

5 Litre

3 Litre

Status

Full

Empty

Empty

Given

8

0

0

1^{st}
Step

0

5

3

2^{nd}
Step

3

5

0

3^{rd}
Step

3

2

3

4^{th}
Step

6

2

0

5^{th}
Step

6

0

2

6^{th}
Step

1

5

2

7^{th}
Step

1

4

3

8^{th}
Step

4

4

0

There are three bottles of capacity 32 litre, 20 litre, 12
litre. Bottle of capacity 32 litre is full of milk. It is equally divided into
two bottles 32 litre and in 20 litre.
There is no other source of measurement, solve the problem and you can make use
of 12 litre bottle.
There is a bridge of 1 km long and a train of 1 km long.
Speed of train is 1 km/minute. What is the time in which the train crosses the
bridge.
Complete the following figure without any break and any over flow ie without pickup the pencil and without over write complete the following figure in one flow of the pencil.
Riddle No 13
A stone is of weight 100 kg. It is divided into 5 small
weights in such a way that we can weigh every item from 1 kg to 100 kg.
One person have Rs 20. He want to purchase three items Note
book of Rs 4, Pen of 50 paise, and pencil of 25 Paise. Help the person so that
he can purchase every item and total item should be 20.
Riddle No 15
Two persons each having
30 mangoes. First person sells 2 mangoes for Rs 1 and second person sells
3 mangoes for Rs 1. In this way first person got Rs 15 and second person got Rs
10 and both got total Rs 25. One day second person fall ill and First person
has to sell all mangoes. In order to avoid the confusion of 2 or 3 mangoes
First person mixes all the mangoes and start selling 5 mangoes for Rs 2. In
this way total sale is of Rs 24. Where Rs 1 go. Help the person to find Rs 1.
Riddle No 16
Once three friend went to a restaurant for dinner. Waiter
told then that cost of one diet is Rs 25. All ate food and pay Rs 25 each to
the waiter. The owner of the Restaurant happily tell the waiter that return Rs
5 to them. Waiter thought that how can I distribute Rs 5 among three people. He
put Rs 2 in his own pocket and return Rs1 to each of them. In this way each
person pay Rs 24 for the food. Now explain how this is possible
24 x 3 = Rs 72 + Rs 2 (In the pocket of the waiter) = Rs 74
Explain where Rs 1 go ?
Riddle No 17
There are four temples and in between them there is a pool. A person went to the temple along with some flowers. He offered 8 flowers in first temple and then dip the remaining in the pool, the flower become double. He again offered 8 flowers in the second temple and dip the remaining in the pool. Flower again become double. He continue this process upto the last temple. When he offered 8 flowers in the last temple then he left with no flower. Now the question is how much flower he have initially.
Once a person went to the casino along with some money. The gate keeper charges Rs 5 to enter and coming out of the room. He payed Rs 5 and entered the room. Inside the room he doubled the remaining money. Then he came out due to certain work and again go inside the room. For this he paid Rs 5+5=Rs10. Inside the room he again doubled the remaining money and then came back. At the gate when he pay Rs 5 to the gate keeper then he left with no money. Now the question is how much money he have initially.
To cross a bridge a person has to take 30 minutes to reach the middle of the bridge. In the middle of the bridge there is a watchman. The watchman sleeps for 30 minutes and wake up for 30 minutes. He charges Rs 100 from each person who crosses the bridge. Now the question is how a person without money cross the bridge.
Riddle No 20
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