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11,667 trader trainee interview questions shared by candidates

Two people are 60 km apart. If the two people, one travelling at 25 km and another at 35 km, will collide into each other and there is a fly that can travel at 40 km, then how much distance will the fly cover before the two people collide? If there is one pad in a pond and the number of pads doubles every day, it'll take 30 days for the pads to fill the pond. How long will it take for the pads to fill the pond if there were 8 pads on the first day? A person asks his friend the ages of his three daughters. The friend says that if their ages are multiplied then the answer is 36. The person says "that isn't information". The friend says that if you add their ages then it's equal to my house number. The person says there still isn't enough information. The friend says that my youngest daughter has blue eyes. The person says "OK I know now". What are the ages of the daughters?
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Junior Trader

Interviewed at Cobblestone Energy

4★
Oct 25, 2020

Two people are 60 km apart. If the two people, one travelling at 25 km and another at 35 km, will collide into each other and there is a fly that can travel at 40 km, then how much distance will the fly cover before the two people collide? If there is one pad in a pond and the number of pads doubles every day, it'll take 30 days for the pads to fill the pond. How long will it take for the pads to fill the pond if there were 8 pads on the first day? A person asks his friend the ages of his three daughters. The friend says that if their ages are multiplied then the answer is 36. The person says "that isn't information". The friend says that if you add their ages then it's equal to my house number. The person says there still isn't enough information. The friend says that my youngest daughter has blue eyes. The person says "OK I know now". What are the ages of the daughters?

You and a friend are betting on individual games of the World series. For each game, if your team wins, you win a certain (positive) amount of money, and if your team loses, you lose that amount. You and your friend create a betting scheme such that you will win 1000 dollars if your team wins and lose 1000 dollars if your team loses, regardless of the game score (it could be 4-3, 2-4, etc.). How much do you bet on the first game?
avatar

Trader

Interviewed at Jane Street

4.4★
Jan 20, 2012

You and a friend are betting on individual games of the World series. For each game, if your team wins, you win a certain (positive) amount of money, and if your team loses, you lose that amount. You and your friend create a betting scheme such that you will win 1000 dollars if your team wins and lose 1000 dollars if your team loses, regardless of the game score (it could be 4-3, 2-4, etc.). How much do you bet on the first game?

Every morning, Mike the security guard at CP high school opens all 1000 doors in the building. Let's assume the doors are numbered 1-1000. The next security guard closes all even numbered doors. The third security guard touches all doors that are multiples of 3. If a door is open, he'll close it and vice versa. The fourth guard changes the position of every fourth door (if it's open he'll close it etc.,) and the fifth guard changes the position of every fifth door and so on, until the 1000th guard changes only door 1000. HOW MANY DOORS ARE LEFT OPEN IN THE END?
avatar

Assistant Trader

Interviewed at Susquehanna International Group

3.8★
Jul 22, 2015

Every morning, Mike the security guard at CP high school opens all 1000 doors in the building. Let's assume the doors are numbered 1-1000. The next security guard closes all even numbered doors. The third security guard touches all doors that are multiples of 3. If a door is open, he'll close it and vice versa. The fourth guard changes the position of every fourth door (if it's open he'll close it etc.,) and the fifth guard changes the position of every fifth door and so on, until the 1000th guard changes only door 1000. HOW MANY DOORS ARE LEFT OPEN IN THE END?

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