50 Puzzles Commonly asked in HR Interviews

#SimplyLogical #InterviewPuzzles

50 Puzzles Commonly asked in HR Interviews

00:00 - 8 Balls Weight Puzzle (Interview Puzzle) || 8 Identical Balls Problem || 8 Balls Problem
03:08 - Crossing Bridge Puzzle || Bridge and Torch Puzzle
06:33 - Gold Bar Puzzle || Gold Bar Distribution Puzzle
09:16 - 3 Ants and Triangle Problem || 3 Ants Problem
11:41 - Matchstick Puzzle (Hexagon to equilateral Triangle )
13:48 - Fox, Chicken, Corn Puzzle
16:21 - Defective Box Puzzle
19:23 - Supersonic Bee
25:46 - Find Ages of Daughters
28:46 - 81 Cows Distribution Puzzle
35:58 - Measure 1 KG Rice
43:52 - Red Hat vs Blue Hat
53:30 - Batteries and Torch Problem
57:27 - The Fox and Duck Puzzle
01:03:35 - Man fell in well puzzle
01:06:15 - Traveller and Coconut Puzzle
01:09:34 - Headshot Puzzle
01:12:33 - Burning Rope Puzzle
01:16:13 - Best Time to Escape
01:19:32 - 3 Glass and 10 Coins
01:21:52 - Three Ants Go Marching
01:23:05 - 4 Prisoners Puzzle
01:26:34 - 9 Dogs Fence Problem
01:27:46 - The Rabbit Problem
01:32:54 - 13 Caves and Thief Puzzle
01:36:43 - 100 People In a Circle
01:41:38 - Bat and Ball Puzzle
01:44:26 - Camel Race Puzzle
01:46:23 - Cat In a Square Room Puzzle
01:49:04 - Farmer Fencing Problem
01:51:09 - Grandma and Cakes Puzzle
01:54:55 - Lily Pond Puzzle
01:57:09 - Famous Egg Problem
01:59:23 - Hotel With 100 Rooms Riddle
02:01:19 - Blue Black and Red Socks Puzzle
02:02:32 - Quarantine Puzzle
02:04:21 - Teresa’s Daughter Puzzle
02:06:47 - An Island of Puzzles
02:09:56 - A Door of Fate and Logics
02:12:47 - 100 Doors Puzzle
02:17:27 - 240 Barrels of Wine Puzzle
02:24:05 - 2014 Bulbs Logical Puzzle
02:28:41 - 100 Floors and Egg Problem
02:38:07 - 5 Pirates and 1000 Coins Puzzle
02:53:37 - Heaven or Hell Puzzle
02:55:52 - How Much Money Initially Had ?
03:00:00 - Is Your Husband a Cheat ?
03:05:19 - Number Of Squares In ChessBoard
03:10:26 - Find The Fastest 3 Horses
03:15:39 - Flip The Triangle
03:18:33 - Measure 4L using 3 buckets

[SimplyLogical]

🔥🔥 50 Puzzles Commonly asked in HR Interviews 🔥🔥

[agytjax]

At 28:46, the cow distribution problem's solution has been unnecessarily complicated. There is a simple and elegant solution. Arrange all numbers 1through 81 in a magic square - you need to have two such squares stacked one above the other.

1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45
46 47 48 49 50 51 52 53 54
55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72
73 74 75 76 77 78 79 80 81
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45
46 47 48 49 50 51 52 53 54
55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72
73 74 75 76 77 78 79 80 81


Now, add the numbers diagonally from the 1st column in first row, 2nd column in second row and so on. It will add up to 369 and the columns of the diagonal will give you the cow's number. Unfortunately, YT doesn't let me copy the rich text format. However, you can see below the magic square based solution

1st son : 1, 11, 21, 31 ... 81
2nd son : 10, 20, 30 ... 9
...
9th son : 73, 2, 12, 22 ... 72

[agytjax]

I love how this guy goes : "Let me simplify ..." and repeats verbatim whatever he said until then . Repeating == Simplifying 🤣🤣

[GeoffAlbertson]

This is a great collection of logic puzzles suitable for interviews. Thank you.

[GaborRevesz_kittenhuffer]

56:05 given batteries b1, ..., b8 of which 4 work, you need only try at most 6 pairs of batteries — not 7 pairs! — in order to find a working pair:

1. if none of the pairs {b1, b2}, {b2, b3}, {b3, b1} work, then you know that at least 2 of {b1, b2, b3} are faulty.

2. likewise, if none of the pairs {b4, b5}, {b5, b6}, {b6, b4} work, then you know that at least 2 of {b4, b5, b6} are faulty.

3. therefore you either found a working pair among {b1, ..., b6} or else you know that all 4 of the faulty batteries are in {b1, ..., b6} — in which case the remaining b7, b8 must both work.

thus you only need at most 6 — not 7 — tests to find a working pair of batteries.

[agytjax]

At 03:05:19 : You can simply use the formula to find sum of first 'n' square numbers : n(n+1)(2n+1)/6 !

[tirtheshkode]

In the gold bar, king and worker question-- What if the worker sells the 1/7th bar which he gets after the day 1 of work and purchases something? The question shouldv'e mentioned that the worker does not uses the gold bar for till the end of the 7th day to make any purchase.

[PrinceKumar-zoex]

3Ants and Triangle-
Collision doesn’t happen only in two cases - All ants going in (a)clockwise (b)anti-clockwise
Every ant has two choices and there are total 2^3 possibilities = 8.

Out of 2^3 possibilities, only 2 don’t cause collision.
probability of ants doesn't collide is 2/8 =1/4 =0.25.

[adityaranjan]

Q.50: Another approach

Step1: Fill 5L bucket with 5L water.
Step2- Pour the 5L water from 5L bucket to 8L bucket.
Step3- Repeat step 1 & 2 again.
Step4- you’re now left with 2L water in 5L bucket.
Step5- pour 2L water from 5L bucket to 3L bucket.
Step6- Fill 5L bucket with 5L water.
Step7- since 3L bucket has already 2L water in it (step 5), therefore while filling the water from 5L bucket to 3L bucket, only 1L water will be poured to 3L bucket and 5L bucket will remained with 4L water.

[Vinicius-gowh]

The puzzles are so badly written, you come up with rules that were not specified...

[ejrupp]

#10 ... n² = (n²-1)+1 = (n+1)(n-1)+1, so if you do not have an even x even grid you can convert it to one with 1 remainder.
By subtracting one number from each row of (n-1) you have (n-1)(n+1) - (n-1) + 1 = (n-1) ((n+1) -1) + 1 = (n-1)(n-1+1) + 1 = (n-1)(n) + 1. So to add it back (n-1)(n) + 1 + (n-1). So it equals in this case (9)(9-1) + R + column of 8 numbers converted to a row = 9x9. This is just the math way of saying you can take one number from each row, and place it in a new row underneath (rotate 90 degrees) with the remainder and have an n x n matrix or grid. Drop down the remainder, n² (81), to the last row and slide the right hand section to fill the spaces. The first number of the nth row is the remainder.

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40 ← take this 10x8 + the Remainder 81 & convert to a 9x9
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80

1 2 3 4 5 6 7 8 ↓ 10 ←
11 12 13 14 15 16 17 ↓ 19 20 ←
21 22 23 24 25 26 ↓ 28 29 30 ←
31 32 33 34 35 ↓ 37 38 39 40 ←
41 42 43 44 ↓ 46 47 48 49 50 ←
51 52 53 ↓ 55 56 57 58 59 60 ←
61 62 ↓ 64 65 66 67 68 69 70 ←
71 ↓ 73 74 75 76 77 78 79 80 ←
81 72 63 54 45 36 27 18 9 ← new row.

1 2 3 4 5 6 7 8 10
11 12 13 14 15 16 17 19 20
21 22 23 24 25 26 28 29 30
31 32 33 34 35 37 38 39 40
41 42 43 44 46 47 48 49 50
51 52 53 55 56 57 58 59 60
61 62 64 65 66 67 68 69 70
71 73 74 75 76 77 78 79 80
81 72 63 54 45 36 27 18 9

9 columns of 9 that add to 369.

I hope this posts correctly.

[prudviraj]

2:07:54 7 trips, like first-349 return 3(2 trips) -second time-153 return 3 (2 trips)- third time -736 and return 6 (2 trips) -finally 286 --totally 7 trips..

[kartika]

Awesome and really helpful content 👏 a lot 🙏 😊

[Sanket_Jagtap]

In the 50th Puzzle (scenario 1), I have a much more straightforward and quick solution. 👇
First, fill the 5-litre bucket entirely and pour 3 litres of water into a 3-litre bucket. Now, shift that remaining 2 litre of water into 8 Litre bucket. Do this step again, and you will get the 2+2 = 4 Litre water in the bucket of 8 Litre capacity 😌

[joer]

Puzzle 24. Thief and 13 caves: if instead of checking cave 13 each day, they check the next cave instead (ie Day1 the police check 12 & 13. Day 2 Police check 11 & 1... then on the 6th day they will check caves 7 & 5. Day 7 they have their thief. The answer is 7, not 12.

[carolineprenoveau]

About the thief in the cave one, is there a reason not to catch the guy in a sandwich by going C1 C13, then C2 C12, then C3 C11, etc? That would make it 7 days instead of 12.

[ejrupp]

You can cut the gold bar into 4 pieces using a crossing cut (1/8, 1/8, 2/8. 4/8). 1/8 day 1 = 1/8, 1/8+1/8 day 2 = 2/8, trade a 2/8 for a 1/8 day 3 = 3/8, trade 4/8 for 1/8 & 2/8 day 4 = 4/8, 1/8 day 5 = 5/8, 1/8 day 6 = 6/8, trade 2/8 for 1/8 day 7 = 7/8. You keep 1/8 for yourself.

[muadrahmanm]

Question 50. 3:24:31
Just pour water from 5L to 3L bucket we got 2L repeat the same🙄 why this much complicated

[SHUBHAMJHA-og]

1:22:59 the ants are walking on a 3d shape like a branch, from their perspective they are following the straight path but in reality they are just walking on the lateral circumference of the branch.

[VikramSingh-lesy]

Excellent collection, best puzzles for interview preparation. Stop point for all good puzzles. Thanks bro 😎