## Search Results

### Monday Morning Braintease: thought process on goats and panthers

120 panthers and one goat are put on a magic island that only has grass. Panthers can eat grass, but they would rather eat goats. Assume: A. Each time only one panther can eat one goat, and that panther itself will become a goat after it eats the goat. B. ...

*104 comments - 2 silver bananas - May 15 2015 - 2:26pm - Buddyfox*### Do you know algebra?

So it seems that there are some math people around. To follow up on http://www.wallstreetoasis.com/forums/harder- brainteaser-than-the-coin-flip here is another one: Given: a^2+b^2=c^2+d^2 a^3+b^3=c^3+d^3 Show that: a+b=c+d Requires middle school math, bu ...

*399 comments - 1 silver bananas - Nov 30 2011 - 10:41am - Dr Joe*### Easy Brainteaser

As penance for liberally beating a dead goat in the other brainteaser thread, here is a fresh one that should be easy for many of you: Does.9 repeated = 1? Please prove mathematically and explain in English. SB for the first to do both. question brainteas ...

*43 comments - 0 silver bananas - May 7 2012 - 7:59pm - illiniPride*### Brainteaser Tuesday

So it's Tuesday and I'm guessing you guys are either burned out from modeling or bored out of skulls editing pitch books so I thought we'd play a little game. I know you've done this before, so you all know the drill: I post a braintea ...

*27 comments - 0 silver bananas - May 17 2011 - 8:32pm - Jorgé*### Monday Morning Braintease- Two Questions

Happy Monday. Let's see if you can get your brain working after the pre-4th of July weekend fun you had. Two questions for you this morning: 1- What is the probability that the first business day of a month is a Monday? 2- What is the greatest dollar ...

*18 comments - 2 silver bananas - Apr 9 2016 - 11:28am - Buddyfox*### Harder brainteaser than the coin flip

Suppose X ~ Normal(0; 1) and Y = X + epsilon, where epsilon ~ Normal(0; sigma^2) and epsilon is independent of X. Conditional on observing Y, what is the distribution of X? SBs for 1st correct answer Edit- this is in response to // www.wallstreetoasis.com ...

*28 comments - 1 silver bananas - Nov 15 2011 - 4:48pm - Dr Joe*### Tough GS analyst I-View Brainteaser- can you help solve it? USD 1m or GS offer?

Hi guys, a friend of mine got following interview brainteaser at a GS internship interview: If you had the choice between 1m USD in cash and an unconditional Job offer at GS- what would be the more attractive Option financially in your view? Please try to ...

*17 comments - 0 silver bananas - Jan 3 2015 - 6:37pm - decurion99*### Monday Braintease

A 10x10x10 rubiks cube is completely submerged in a bucked of paint. How many cubes do not have any sides covered in paint? brainteaser ...

*22 comments - 1 silver bananas - Apr 16 2012 - 3:24pm - Buddyfox*### Monday Morning Braintease: airplane seats

There are 100 people in line to board an airplane. Each person is holding a ticket corresponding to both his place in line and his seat (i.e. Person 1 is supposed to sit in Seat 1, Person 2 is supposed to sit in Seat 2, etc.). All of the people in line ar ...

*16 comments - 0 silver bananas - May 15 2015 - 2:25pm - Buddyfox*### Monday Morning Braintease: clock hands

Monday again, shit. If you look at a clock and the time is 9:45, what is the angle between the hour and the minute hands? Show thought process. brainteaser ...

*15 comments - 2 silver bananas - May 15 2015 - 2:25pm - Buddyfox*### Crazy D.E. Shaw phone interview question-- Help!

I had a first round phone interview for a quant trader position with D.E. Shaw today, and got stumped on what seems like a pretty simple probability question (see below). Do any of you know how to figure it out? I think it deals with combinations. There a ...

*18 comments - 0 silver bananas - Mar 1 2011 - 8:02pm - quantOBSESSED1*### Brainteaser- How many friends would you have to make to connect to everyone on Facebook?

Was asked this in a recent interview. How do you guys approach such brainteasers? I understand that its all about practice but it there a definite method we could follow? brainteaser ...

*13 comments - 0 silver bananas - Oct 13 2011 - 1:11pm - dreamtheater12*### S&T 2nd round Brainteaser most people screw up!

Came across this MM S&T brainteaser and wanted to share it with you guys: You have three pancakes. One pancake is burnt on one of it's two sides. Another is burnt on both of its sides. The last one is not burnt on either of its sides. If we were ...

*10 comments - 0 silver bananas - Sep 17 2014 - 1:37am - Mat-Reis*### Job Interview Brainteaser

Got this at an interview at a reputable hedge fund and blew it: You're walking up a hill at 6am and finish at 6pm at the summit. The next day you start walking back down at 6am and get to the bottom of the hill at 6pm. What's the probability tha ...

*13 comments - 0 silver bananas - Oct 7 2010 - 4:07pm - lolercoasterrr*### Brainteaser Interview Q- How many bars are there in the IU.S.?

I was looking at all kinds of brainteaser questions, one of them was "How many bars are there in the U.S.?" How would you guys approach this question? Pls no answers like, 'i'll look it up on google' or any of those sorts. brainte ...

*13 comments - 0 silver bananas - Apr 2 2010 - 11:03pm - taesangk*### Did I completely screw up my first interview brainteaser?

I just finished a phone call with a potential internship opportunity and can't help but think I messed up on (what should've been) an extremely easy question. Here is the scenario: You have the opportunity to play a game. This game involves a fa ...

*9 comments - 1 silver bananas - Nov 6 2014 - 2:47pm - PE Hopeful*### Brainteaser Approach?

Heres the question: Whats the difference between me (interviewer) and you(Interviewee) in light years? Best approach? brainteaser ...

*11 comments - 0 silver bananas - Oct 15 2010 - 10:34pm - PIE*### The airplane, the island, and the millionaire

Alright, so a really brilliant friend of mine posed an incredibly intriguing scenario today and I don't know what the correct answer is, if there even is one. Thoughts? Here it is: An aeroplane drops a nuke on an island as part of a military test. Un ...

*10 comments - 0 silver bananas - Jul 10 2012 - 8:10pm - Sonic*### Monday Morning Braintease (the original)

Four bankers, Al, Bob, Cal and Dave need to get across a river. The only way to cross the river is by an old bridge, which holds at most 2 people at a time. Being dark, they can't cross the bridge without a flashlight, of which they only have one. So ...

*10 comments - 1 silver bananas - May 14 2012 - 8:38am - Buddyfox*### Brainteaser help

I am having some trouble with this brainteaser from Crack's book. Here is the question: You are bidding for a firm whose unknown true value is uniformly distributed between 0 and 1. Although you do not know the true value S of the firm, you do know t ...

*10 comments - 0 silver bananas - Sep 18 2009 - 1:13am - electricfeel*### Solve this question

Currency Lending Rate Borrowing Rate US Currency ($) 6.73% 7.20% Foreign Currency 6.80% 7.28% Milly Bank can borrow either $20 million or FC20 million. The current spot rate of the FC is $1.13. Furthermore, Milly Bank expects the spot rate of the FC to be ...

*10 comments - 0 silver bananas - Mar 6 2009 - 4:37am - mack387*### Monday Morning Braintease- Probability

I apologize for the late post, I usually like to try to get these out in the morning...hence the name. You have an object whose weight is an integer value somewhere between 1 and 100 and a balancing scale. What is the fewest number of weights you need to ...

*7 comments - 1 silver bananas - Apr 9 2016 - 11:28am - Buddyfox*### Brainteaser for job interview

Does anyone have any ideas for this brainteaser? If you have a crystal ball that predicted that both a German Bond (Fund) and an S&P 500 listed equity would both yield 5% over the next year and you had US$500,000 to invest, which instrument would you ...

*8 comments - 0 silver bananas - Feb 16 2013 - 3:19am - adast027*### Brainteaser- What would the population be?

If tomorrow there was a sudden destruction of all the food sources available to people, apart from other people. Assuming that on average one human body would feed 1 person for 2 weeks. What would the population of the world be in 1 years' time? Worl ...

*7 comments - 0 silver bananas - Apr 8 2016 - 10:59pm - BoxerRebeller*### Brainteaser- What number comes next?

The sequence of numbers given is- 2 4 4 16 16-and you need to figure out what number comes next. Obvious choices were 256 or 16...but the answer, according to the book the question is from, is 196. I can't for the life of me figure out why. Is it a t ...

*9 comments - 0 silver bananas - Nov 13 2008 - 2:53am - razzmatazz*### Monday Morning Braintease: golf balls

You have 100 golf balls (50 yellow balls and 50 white balls) and 2 buckets. How do you divide the balls into the two buckets so as to maximize the probability of selecting a yellow ball if 1 ball is chosen from 1 of the buckets at random? What is the perc ...

*7 comments - 0 silver bananas - May 15 2015 - 2:26pm - Buddyfox*### Guesstimating CAGR

I am looking for guesstimating CAGR across long time horizons. eg An investment grew 16X in 25 years, what's the CAGR? I am looking for ball park figures here. brainteaser ...

*6 comments - 0 silver bananas - Aug 13 2015 - 8:39am - jr.ab*### Can Brainteasers be taught?

Can the types of difficult brainteasers asked during interviews at prop trading firms (Jane Street, sig, Getco etc.) be self-taught? In my case, I suppose I have naturally strong quantative skills (got an 800...somehow), but with that said I haven't ...

*7 comments - 0 silver bananas - Jun 5 2013 - 5:29am - CarmeloAnthony*### Best Interview Prep

http://www.nydailynews.com/life-style/health/beer-... So apparently research shows that not being sober will help your problem solving skills, but lower performance with memory tasks. Article goes over an interesting study with brainteasers on a decent sa ...

*7 comments - 0 silver bananas - Apr 15 2012 - 1:12am - Toronto*### Can you solve this PE interview brainteaser?

Imagine you have a special dollar. You can play a game with me. I'll toss a coin and if you call it right, you have two dollars; if not, you take home only one dollar. You can keep playing if you call correctly, doubling your money each time How much ...

*4 comments - 0 silver bananas - Jun 19 2017 - 9:31pm - newyorkermonkey*### How to polish a turd?

Hey, how do you guys deal with situation in which you have no clue what the answer could be. Obviously, most of the questions can be approached logically but what about the cube root of a number or the last 4 digits x^81. Many thanks! Investment Banking i ...

*6 comments - 0 silver bananas - Nov 20 2011 - 8:57am - all_in*### Monday Morning Braintease (2 of 2)

A Saudi prince tells his two sons to race their horses to a distant city to see who will inherit his fortune. The one whose horse is slower will win. The brothers, after wandering aimlessly for days, ask a wise man for advise. After hearing the advice the ...

*5 comments - 0 silver bananas - Jun 4 2012 - 9:04am - Buddyfox*### Monday Morning Braintease (1 of 2)

An army tank is crossing a 3 mile bridge that can only support 40,000 pounds and that's exactly how much the tank weighs. Halfway across the bridge a 2 ounce bird lands on the tank, but the bridge doesn't collapse. Why not? Show thought process. ...

*5 comments - 0 silver bananas - Jun 4 2012 - 9:02am - Buddyfox*### Brain Teasers- Quick read

From google. http://online.wsj.com/article/SB100014240529702045... Its just sad that instead of this, we continue to have the MD, VP, Associate and Analyst cross the bridge with one flashlight. interview google brainteaser ...

*4 comments - 0 silver bananas - Apr 19 2016 - 1:18pm - monkeyc*### Best Brainteaser

What's the hardest and/or most memorable brainteaser you've gotten in an interview? interview Prop trading brainteaser ...

*4 comments - 0 silver bananas - Oct 16 2010 - 10:50pm - DeighTrader*### Brainteaser- Unlimited vases?

You have 10 blue balls, and 10 black balls. There are two vases. If you pick a blue ball you win, black ball you lose.What allocation gives you the highest probability of picking a blue ball. What about if there were unlimited vases (anywhere up to 20)? b ...

*3 comments - 0 silver bananas - Apr 8 2016 - 10:50pm - MandA_Junkie*### Brainteaser- Closing out the game?

Darts: Carl can close out the game with his next turn...if his last throw is a double bulls-eye, what two possible combinations could he use to win with? (Combination1) A triple(1-5) and a double (1-5), or (combination 2) a triple 1-5 and a double 1-5 bra ...

*- 0 silver bananas - Apr 8 2016 - 10:50pm - wannabe2013*