Ticket Puzzle

Ticket Puzzle:

Hidden data puzzles are commonly asked in Interviews. These puzzles make us analyze the hidden data in the questions.

Question:

There are N stations on a railway. After adding X stations 46 additional tickets, have to be printed. Find N and X?

Answer:

Total Tickets = (Total Stations)*(Total Stations- Boarding Station)

So,

N (N-1) = t

After adding X stations

(N+X) (N+X-1) = (t+46)

Solve: X=2, N=11

Bullets Puzzle:

Bullets Puzzle:

Very interesting Interview puzzle; It involves analysis work. Here let us read it.

Question:

Three friends divided some bullets equally. After all, of them shot 4 bullets the total number of remaining bullets is equal to that of one has after division. Find the original number divided?

Answer:

Statement 1: divided bullets equally

 X        X         X

Statement 2: All shot 4 bullets

X-4      X-4      X-4

Statement 3: total remaining is equal to one has after division

3X-12 = X

X = 6

So, Total Bullets = 6+6+6 = 18.

Clock Puzzle:

Clock Puzzle:

Clock problems appear at last in many interviews and many don’t attend it. So, lets try to attend it herewith

Question:

At 6 o clock, clock ticks 6 times. The Time between first and last ticks was 30 second. How much time it takes at 12 o clock?

Answer:

66 seconds

At 6:- 6 times- 30 seconds as, given (6-1= 5- between first and last tick) 5* 6 = 30

At12:-x times- x seconds as from above (12-1 =11) therefore 11 * 6 = 66

Chain Puzzle

Chain Puzzle:

This question will be asked in the technical round in some Interviews just to check how to think?

Question:

A chain is broken into 3 pieces of equal length containing 3 links each. It is taken to a blacksmith to join into a single continuous one. How many links are to be opened to make it?

Answer:

2 links have to be opened. Open the second link on both sides. Therefore, 2 links are opened.

Age Puzzle:

Age Puzzle:

This Kind of age Puzzles are asked in first round of any Interview. Read the Question and answer it.

Question:

If the digits of my present age are reversed then I get the age of my son. If 1 year ago my age was twice as that of my son. Find my present age?

Answer:

Statement1: Father Age and son age are in reverse order.

Statement 2: (Father Age – 1) = (2 * Son age)

Analyzing we arrive at

Father age: 73

Son Age: 37

Milk Jar Puzzle

Milk Problem again:

This is a slightly modification of the milk problem commonly asked in interviews. Infosys interview will focus on milk problem and this is the question asked in Infosys interview.

Questions: 

Using 4- gallon and 7-gallon jar fill or take 5 gallons?

Answer:

Fill Milk in 4 gallon first and pour it into 7-gallon jar.

Repeat the same.

Now, 1 gallon of milk remains in 4-gallon jar.

Shift the milk in 7-gallon jar and empty it.

Fill 1 gallon milk from 4-gallon jar into 7-gallon jar.

Fill Milk in 4 gallon and pour into 7-gallon jar making a total of 5 gallons

Milk Problem again:

This is a slightly modification of the milk problem commonly asked in interviews. Infosys interview will focus on milk problem and this is the question asked in Infosys interview.

Questions: 

Using 4- gallon and 7-gallon jar fill or take 5 gallons?

Answer:

Fill Milk in 4 gallon first and pour it into 7-gallon jar.

Repeat the same.

Now, 1 gallon of milk remains in 4-gallon jar.

Shift the milk in 7-gallon jar and empty it.

Fill 1 gallon milk from 4-gallon jar into 7-gallon jar.

Fill Milk in 4 gallon and pour into 7-gallon jar making a total of 5 gallons

Faulty Coin Puzzle

Faulty coins:

This type of faulty coins/cigarette questions are very often asked in interviews. This was the question asked in my Interview too. Therefore, everyone learn to answer it.

Question:

There are 10 sets of 10 coins. You know how much the coins should weigh. You know all the coins in one set of ten are exactly a hundredth of an ounce off making the entire set of ten coins a tenth of an ounce off.

You also know that all the other coins weight the correct amount. You are allowed to use an extremely accurate digital weighing machine only once. How do you determine which set of 10 coins is faulty?

Answer:

Take 1 coin from first, 2 coins from second, 3 coins from third and so on till 10 coins from tenth set.

Weigh the coins, which you have taken from 10 sets in a manner described above.

Check the weight-

If you find that weight is off by one hundredth of an ounce, the first set is faulty.

If you find that weight is off by two hundredth of an ounce then the second set is faulty.

So on…

Milk Jar Puzzle

Old Milk Problem:

This is the old milk problem where almost most of them know. Yet these kinds of questions are asked in Interviews in slightly modified form. So, just know the method and the idea.

Question:

You have 3 gallons and 5 gallons measuring Jar. How will you measure 4 gallons of Milk?

Answer:

There are two methods to solve this

1. Pour Milk in 3 gallon first and from the 3 gallon jar pour into 5 gallon.

Repeat the same so that 1 gallon remains in 3 gallon. Now, take it aside to the new vessel and pour from 3 gallons to make 1 + 3 = 4 Gallons

2. Pour Milk in 5 gallon first and from that 5 gallon pour into 3 gallon, so 2-gallon milk remains in the 5 gallon jar. Take it to new vessel. Repeat the same. 2 + 2= 4 gallons

Age Puzzle

Age Problem:

Age problems are asked in Interviews to analyze your data interpretation. Therefore, when two related data are given we need to interpret and find the solution. Proceed to read the Question

Question:

Fathers age is 3 years more than 3 times the son’ age; After 3 years, father’s age will be 10 years more than twice the son’s age. What is father’s present age?

Answer:

Statement1:  Father = 3(son) + 3

After 3 years

Statement 2: Father = 2(son) + (3+10)

Solve both equations

Father’s age = 33; Son’s age = 10.

Ticket Puzzle

Railway Tickets:

In Interviews, they tend to ask question with incomplete data in question but there is always some hidden in the question. Your first aim must to track the hidden data and proceed with the solution. Now let us see the Question.

Question: 

Assume there are 25 stations. Train can go up line and down line and also to and fro among stations. Therefore, how many different kinds of Tickets should be there in Total?

Answer:

Hidden data- At each station passenger gets ticket for any of other 24 stations.

Number of different tickets= 25*24=600 tickets

Therefore, to and fro type ticket= 600*2=1200

Grand Age Puzzles

Grand Father and Grand Son:

These kind of age related puzzles are very common in interviews. This is one such famous age related puzzles commonly asked. The Interview puzzle is explained below:

Question:

In 1932, I was as old as the last two digits of my birth year. When I mentioned this interesting coincidence to my Grandfather, he surprised me by saying that the same applied to him too. I thought that is impossible. However, he proved it.

Answer:

For Grandson: First Two digits of birth year: 19.

Therefore, if born in 1916, he would become 16 years in 1932

For Grandfather: First Two digits of birth year: 18.

So, 100(from 1800) +32=132

132 divided by 2 gives 66.

Therefore, if born in 1866, he would be 66 in 1932.