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Chegg.com Interview Puzzle #1 - Faulty Coins Interview Question

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You have ten sets of 10 coins. You are aware of exactly how much the coins weigh. You also know that all the coins in one set of ten are exactly a hundredth of an ounce off which makes the entire set of the ten coins a tenth of an ounce off. Also you are aware of the fact that all the other coins weight the correct amount. Now you are allowed to use an exceptionally precise digital weighing machine only once.

Can you identify which set of 10 coins is faulty?

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Chegg.com Interview Puzzle #2 - Popular River Crossing Interview Puzzle

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There is a river which has to be crossed using a boat that can accommodate only two persons at a time. On one side are three missionaries and three cannibals. All of them must reach the other side. Also in no condition should greater number of cannibals be left with less number of missionaries or they will eat them.

How will they cross the river?

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Chegg.com Interview Puzzle #3 - Logical Inference Riddle

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A guy visits a house where three identical triplet sisters lived – Sarah, Sue and Sally. Sarah is the oldest one followed by Sue and Sally. The sisters decides to mock him for a while and let him figure out who is who. Due to their identical looks, he is not able to identify who is who and thus decides to ask them each of them a question.

He goes to the sister sitting on the left sofa and asks her, 'Who is the one sitting in the middle sofa?' He is replied by the girl, 'She is Sarah.'

Then he goes to the one sitting on the middle sofa and asks her, 'Who are you?' To this he is replied by her, 'I’m Sally.'

Finally he goes to the one sitting on the right sofa. He asks, 'Who is sitting on the middle sofa?' She replies, 'She is Sue.'

He is left puzzled after the three answers. He asks again and repeats for three times in total. All of the time, he receives different answers.

He only knows three things:
Sarah, the oldest one is a truthful person who never lies.
Sue the middle sister is a big liar who never tells a truth.
Sally, the youngest speaks both truth and lies.

Can you help him find out who is who?

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Chegg.com Interview Puzzle #4 - Famous Elevator Riddle

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Tanu lives on the 13th floor takes the elevator down to the ground floor every morning and goes to her office.

In the evening, when she comes back on a rainy day , or if there are other people around in the elevator, she goes to her 13th floor directly. Otherwise, she goes to the 1oth floor and walks up three flights of stairs to his apartment.

Whats the reason for her unusual behavior ?

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Chegg.com Interview Puzzle #5 - Karamchand Detective Mystery Cipher Riddle

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Karamchand , A well known consulting detective is currently working on an international case where oil is illegally sold.

While inspecting he finds a note under a shelf : 710 57735 34 5508 51 7718

Currently there are 3 suspects: Rooney Bill and Owen.

He breaks the code and found the suspect. can you ?

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