Brainy Puzzles
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RajdeepCE • May 16, 2009

# A very good puzzle

Its very good puzzle. It is simple but still its effective to confuse peple to scratch her heads.
Here is the puzzle:
We have total 100 rs and we need to buy exactly 100 birds. The prizelist for birds is as follow:
1) 1 parrot = 5 rs
2) 1 craw = 1 rs
3) 20 sparrows = 1 rs
But you have to follow these conditions
-> you have to spent all 100 rs.
-> you have to buy exact 100 birds
-> you have to buy all three birds. That mean you cant buy any specific kind of bird. So you must have all three kind of bird when you finish the buying!!!!
Lets hit it CEans!!!!
sanandsanu • May 16, 2009
RajdeepCE
Its very good puzzle. It is simple but still its effective to confuse peple to scratch her heads.
Here is the puzzle:
We have total 100 rs and we need to buy exactly 100 birds. The prizelist for birds is as follow:
1) 1 parrot = 5 rs
2) 1 craw = 1 rs
3) 20 sparrows = 1 rs
But you have to follow these conditions
-> you have to spent all 100 rs.
-> you have to buy exact 100 birds
-> you have to buy all three birds. That mean you cant buy any specific kind of bird. So you must have all three kind of bird when you finish the buying!!!!
Lets hit it CEans!!!!
80 sparrows, 19 parrots and 1 crow
80 sparrows cost = Rs. 4
19 parrots cost = Rs.95
1 crow cost = Rs. 1
---------------------------
100 birds cost = Rs.100
ππ
RajdeepCE • May 16, 2009
You are right!!!
I have to find some tough challenges for CEans!!!
RajdeepCE • May 28, 2009
Here is another simple puzzle for you all CEans!!!
#-> We have a box full of coins & some notes of 10Rs. The box contains the 5Rs, 1Rs, 50Paisa, 25Paisa coins. After counting all the coins, I found the following results :
1-> The quantity of 1Rs coins is three times the quantity of 5Rs coins. That means that if we have 10 coins of 5Rs than we have 30 coins of 1Rs.
2-> Similarly, the quantity of 50Paisa coins is five times the quantity of 1Rs coins. That means that if we have 30 coins of 1Rs than we have 150 coins of 50Paisa.
3-> The quantity of 25Paisa coins is seven times the quantity of 50Paisa coins.
4-> The number of 10Rs notes is 16 + the number of 5Rs coins. That means if you have 4 coins of 5Rs than we have 20 notes of 10Rs.
5-> The total amount in box is exactly 4300Rs.
---> So how many coins & notes were there in the box?
If possible than give the method of your solution.
RajdeepCE • May 28, 2009
For those who want to make a code for this puzzle, just assume the number of 5Rs coin is x. Start making a one equation, than make a code for that equation which will give the answer. This is also a hint for you all crazy CEans!!!!!

80 - 5 rupee coins
240 - 1 rupe coins
1200 - .50 paise coins
8400 - .25 paise coins
96 - 10rs notes.
RajdeepCE • May 28, 2009
Hey ES, great!!! I was expecting that you will get the answer first.
Congrats!!!!!
And wait for more...
RajdeepCE • May 28, 2009
I am starting from another easy one :
A frog in the well trying to climb the wall of well. But the wall is sleepy. Every time he jumps on wall, frog climbs upto 3 feet, but due to wall is sleepy, it sleeps 1 feet. The depth of the well is 50 feet. So tell me that how many jumps will needed for frog to come out from well?
I am expecting the answer of this puzzle as fast as possible, cause it is too easy.
If it sleeps 1 feet in the sense if the effective is 2 feet it takes 25 jumps .

if the sentence means that the effective is 1 feet it takes 48 jumps.

let me know dudeπ
RajdeepCE • May 28, 2009
You are always right, ES!!!
Now I will post some intermediate puzzle tonight, cause the simple puzzles are getting solved in few minutes or hours.
Wait for a blast...
durga ch • May 28, 2009
23?
normally the frog can scale 48mts in 16 leaps
but since it misses 1 mt in each leap total no of mts scaled in 16 leaps is 48-16 = 33mts
its left with 17 mts more which it should cover in 5 leaps e 12 mts scaled

16+5 -21 leaps till now

we are still left with 5 mts ie 2 more leaps

23?
Thanks dude ..

Now try this π

1. Jawaharlal Nehru was the _______ of Indira Gandhiβs Father. ?

2. Make a grammatically correct sentence by using the verb "IS" immediately after the word "I"

3. I am having two coins of Indian currency in my pocket, the total value of which comes to 75 paisa. But mind you, one of the coins is not a fifty paisa coin. How it is possible?

4. What is taken from you before it is given to you?

5.Eventhough it belongs to you, usually others use it, What?

These are tricky questions , dont use google..

Source :: A mail from my friend π
durga
35?
normally the frog can scale 48mts in 16 leaps
but since it misses 1 mt in each leap total no of mts scaled in 16 leaps is 48-16 = 33
it has now 2 more mts to leap.. which implies 1 leap to cover 2 mts + 1 leap to cover the slipped 1 mts

so total = 35
No durga , 48-16 = 32 firstly.
after 16 leaps it is at 32nd fet itself not at 48th so it cant get out , so it need more 18 feets to jump go it??
Kaustubh Katdare • May 28, 2009
Make a grammatically correct sentence by using the verb "IS" immediately after the word "I"
I is a letter in the alphabet.
RajdeepCE • May 28, 2009
Nice questions.!!
I have to scratch my head to solve this!!!
durga ch • May 28, 2009
English-Scared
Thanks dude ..

Now try this π

1. Jawaharlal Nehru was the ---- of Indira Gandhiβs Father. ?

NAME π
English-Scared
Thanks dude ..

Now try this π

1. Jawaharlal Nehru was the _______ of Indira Gandhiβs Father. ?

2. Make a grammatically correct sentence by using the verb "IS" immediately after the word "I"

3. I am having two coins of Indian currency in my pocket, the total value of which comes to 75 paisa. But mind you, one of the coins is not a fifty paisa coin. How it is possible?

4. What is taken from you before it is given to you?

5.Eventhough it belongs to you, usually others use it, What?

These are tricky questions , dont use google..

Source :: A mail from my friend π
1. Name
2. I is the 9th alphabet.
3. one is 50 another is 25. You told one of the coin is not 25 (that coin is of 50 paisa π I am n ot sure if this is correct)
4. Photo

-CB
Big K and Durga both are correct π
today there are many parallel posts done by me with some others all the time.

CB you are 100 percent correct Congrats !!!
π
RajdeepCE • May 29, 2009
Here is another one, and its good:
You have 16 squares in a box, with 5 colors: 4 blue, 3 green, 3 red, 3 white, and 3 black. You have to arrange all 16 squares according tn following condition.
1->>> The same colors cant touch 2->>> The same colors cant be in the same row or in the same column.
shalini_goel14 • May 30, 2009
Re: Brain Teasers : Mathemetics

Hey Rajdeep,

First Row: Green + White + Blue + Red
Second Row: Blue + Red+ Black + Green
Third Row: Black + Green + White + Blue
Fourth Row: White + Blue + Red + Black

PS: Grant excuse if square is not square in actual.π

@Admin/Mods : Oops Sorry I posted it in wrong thread, Can anyone transfer it to following thread
https://www.crazyengineers.com/forum...ematics/22928-very-good-puzzle.html#post66291
RajdeepCE • May 30, 2009
Great Shalini!!!!!
Cograts!!!!
Wait for more...
RajdeepCE • May 30, 2009
Here is another puzzle for you all CEans:
A man has nine children whose ages are at an exact interval. The sum of the square of the ages of each is the square of its own age. Than what is the age of man & his childrens?
i have small doubt and i anticipated question like this ..

The sum of squares of ages of children = square of the mans age.

Considering this , as per the question the ages of children are in AP (Arithmetic Progression ) since common interval is given the diff is considered as d.

so the childs age will be a-4d , a -3d , ---- a , --- ,a+4d

Solving with the other condition as the sum of squares of all these numbers = x^2.

we get the solution as 2 ,5 ,8 ,11,14 ,17 ,20,23 and 26 and the mans age is 48.

PS..how come one man with 9 children π.
RajdeepCE • May 30, 2009
Nice solution, ES!!! & good comment!!!
You are very fast in solving puzzle. I have to give some more difficult puzzle here. Be prepared...
RajdeepCE • Jun 1, 2009
Here, is another one,
9 * ( HATBOX ) = 4 * ( BOXHAT )
Put any digit from 0-9, to make equation correct!!!!
Excellent puzzle , i got a small start to solve this in this way this is not a solution though but a group of digits ,

These are the possible combinations of X and T

X = 0 , T = 0 ,5
X = 2 , T = 7 ,2
X = 4 , T = 4 , 9
X = 6 ,T = 1, 6
X = 8 , T= 3 , 8

So here comes these many possiblities to work for other digits we need all the assumptions , this may throw some lite on solving this π
Sorry to make you go to a big approach π

Here is the easier approach π

Consider HAT as one digit say 'a'
BOX as one digit say 'b'
Since these two digits are there in 2 calculations ,

then the equation turns out as
9(1000a+b) = 4(1000b+a)
8996a = 3991b
692a = 307b
So by this we get a=307 and b=692

So 9 * 307692 = 4* 692307 =2769228
RajdeepCE • Jun 1, 2009
Congrats, ES!!!
Nice explanation.
RajdeepCE • Jun 2, 2009
Here is one another famous puzzle to solve.
"The 8-queens Problem":
I think all the Computer Engineers should know the answer. For those who dont know about it, here it is,
We have given a chessboard & 8 queens, we have to arrange all 8 queens such that queens cant be killed by each other. That means no two queens are in same column or same row, and even they do not come in cross line.
Let us see who get this first!!!!
shalini_goel14 • Jun 2, 2009
Solution for 8-Queens problem

Very good puzzle,

Place 8 queens at following positions taking rows from top and columns from left respectively.

1. 1st Row, 4th Column
2. 2nd Row, 8th Column
3. 3rd Row, 3rd Column
4. 4th Row, 7th Column
5. 5th Row, 2ndColumn
6. 6th Row, 6th Column
7. 7th Row, 1st Column
8. 8th Row, 5th Column

Strategy:
[ I will better explain with a figure but right now I am in office and so wouldn't be able to upload figure so Please wait for pictorial answer. ]

Hope this much information would tell you answer I am trying to tell.
@Rajdeep : How many solutions do we have for this one?

I heard there are around 5 or 7 solutions, a general question though.
RajdeepCE • Jun 26, 2009
@Shalini,your answer is wrong cause 1-4, 3-6, 5-8 pairs are crossing each other. Here is the correct solution,

@ES, not 5-7, but there are many solutions to this puzzle. I dont remember the exact equation of solutions.
RajdeepCE • Jun 26, 2009
Here is new puzzle,
Once upon a time, there was a rich businessman. He had 3 sons. He owned the 21 platinum coated boxes filled with the gold. Aftre he died, his last wish was to divide all his property among his son equally including 21 boxes. He also kept one strict condition that content of all boxes must remain as it is. That means they can't move the gold of one box to other box. When his sons checked the box, they found that 7 boxes were full, 7 boxes were half, & remaining 7 were empty. The judge gave elder brother 4 empty & 3 full box. But he refusted to take 4 empty box. Atlast they all decided that they would accept maximum of 3 box of one kind. So the quest is that, How the judge distributed all the 21 boxes among 3 sons?
For first son 3F ,1HF , 3Emp.

Second and third - 2F , 3HF , 2Emp

Edited::

F-Full
HF- Half Full
Emp- Empty.
RajdeepCE • Jun 26, 2009
F HF E
elder son : 3 1 3
middle son : 2 3 2
younger son : 2 3 2
Yes i solved it correct ,but typed wrong π
Milan25 • Jun 27, 2009
19 parrot = 95 rs
1 craw = 1 rs
80 sparrows = 4 rs
-------------------
100 birds = 100rs
RajdeepCE • Jun 27, 2009
Ok, here I am with new puzzle,
The cricket pitch is 100 feet long. There is a sprint between two batsman: one is tall & second is short. They decided that they have to start from one end and run to the another end than return back to the same end. The tall batsman runs 3 feet distance in 1 step, while short batsman runs 2 feet in 1 step. But when the tall batsman complete 2 steps, the short batsman completed 3 steps. Now tell me that which batsman will return to starting end first? Give a proper logic behind your answer.
Harshad Italiya • Jun 27, 2009
Short one cause tall batsman runs 3 feet in 1 step so after 33 step and 99feet he Crosses 100 feet and go to 102 feet so he have to travel that 2feet again in return journey while short batsman runs for exact 100 feets so he reaches first at Starting end. π
RajdeepCE • Jun 27, 2009
Yes, you are right godfather!!
Congrats!!
nithinstheone • Jul 7, 2009
B G W R
Bl R G B
W Bl B G
R B Bl W

B : BLUE
G : GREEN
W : WHITE
BL : BLACK
RajdeepCE • Jul 7, 2009
Well, this puzzle is already solved & you are still wrong in this.
Anyway, its nice to see someone trying
nirali vora • Oct 8, 2015
We have total 100 rs and we need to buy exactly 100 birds. The prizelist for birds is as follow:
1) 1 hen = 5 rs
2) 1 craw = 1 rs
3) 40 sparrows = 1 rs
But you have to follow these conditions
-> you have to spent all 100 rs.
-> you have to buy exact 100 birds
Prasad Shinde • Oct 10, 2015
Idk