# ***Official Investment Banking Spring Week 2015 Thread*** Watch

1. (Original post by MathsNerd1)
Send me your answer and I'll see if it's the way I have in mind
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Okay.. so the facts are 1 hour ea fuse burns and there are 2 fuses. If we light both fuses at the same time, we won't be able to accurately measure how much time goes by.

However, if we can find out how long half an hour will take by burning 1 fuse, it will give us a shot of using the other fuse to find out 45 minutes.

So because 45 minutes is 3/4 of an hour, we can find out how much half an hour should take by burning fully one of the fuses, assuming we can light from both sides. Even though we aren't given the ratio of burn time the he whole fuse would've taken 30 minutes to burn, if indeed 1 fully takes 1 hour to burn.

If we burnt the other fuse from one side at the same time we burnt the first fuse, this should also give us the same 30 minute time slot. Now to find half of 30 minutes to make up the remaining 15 minutes, we can do the same thing to the second fuse and light it from both sides after the initial 30 minutes has been sorted out. When that fully burns out it should approximate to 45 minutes of time going by, assuming both fuses take 1 hour to burn in actuality.

This method would only allow us to find up to a maximum of 45 minutes, so I'm guessing it's no convinience?

I think this is the only way you can go about solving it, without having the ratio of times each section of the fuse would burn.
2. (Original post by Anonynous)
Spoilered it:

Spoiler:
Show

Okay.. so the facts are 1 hour ea fuse burns and there are 2 fuses. If we light both fuses at the same time, we won't be able to accurately measure how much time goes by.

However, if we can find out how long half an hour will take by burning 1 fuse, it will give us a shot of using the other fuse to find out 45 minutes.

So because 45 minutes is 3/4 of an hour, we can find out how much half an hour should take by burning fully one of the fuses, assuming we can light from both sides. Even though we aren't given the ratio of burn time the he whole fuse would've taken 30 minutes to burn, if indeed 1 fully takes 1 hour to burn.

If we burnt the other fuse from one side at the same time we burnt the first fuse, this should also give us the same 30 minute time slot. Now to find half of 30 minutes to make up the remaining 15 minutes, we can do the same thing to the second fuse and light it from both sides after the initial 30 minutes has been sorted out. When that fully burns out it should approximate to 45 minutes of time going by, assuming both fuses take 1 hour to burn in actuality.

This method would only allow us to find up to a maximum of 45 minutes, so I'm guessing it's no convinience?

I think this is the only way you can go about solving it, without having the ratio of times each section of the fuse would burn.
That's the way I have too, it just shows you how you can actually know a lot by the small amount of information given, at least that's what I think.
3. (Original post by MathsNerd1)
That's the way I have too, it just shows you how you can actually know a lot by the small amount of information given, at least that's what I think.
I don't think I would've figured that out under interview pressure. I read the question like 10 times and was thinking for a while

The questions above, were they asked on SWs interviews?
4. (Original post by Anonynous)
Spoilered it:

Spoiler:
Show

Okay.. so the facts are 1 hour ea fuse burns and there are 2 fuses. If we light both fuses at the same time, we won't be able to accurately measure how much time goes by.

However, if we can find out how long half an hour will take by burning 1 fuse, it will give us a shot of using the other fuse to find out 45 minutes.

So because 45 minutes is 3/4 of an hour, we can find out how much half an hour should take by burning fully one of the fuses, assuming we can light from both sides. Even though we aren't given the ratio of burn time the he whole fuse would've taken 30 minutes to burn, if indeed 1 fully takes 1 hour to burn.

If we burnt the other fuse from one side at the same time we burnt the first fuse, this should also give us the same 30 minute time slot. Now to find half of 30 minutes to make up the remaining 15 minutes, we can do the same thing to the second fuse and light it from both sides after the initial 30 minutes has been sorted out. When that fully burns out it should approximate to 45 minutes of time going by, assuming both fuses take 1 hour to burn in actuality.

This method would only allow us to find up to a maximum of 45 minutes, so I'm guessing it's no convinience?

I think this is the only way you can go about solving it, without having the ratio of times each section of the fuse would burn.
Yeah. It's that

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5. (Original post by Anonynous)
I don't think I would've figured that out under interview pressure. I read the question like 10 times and was thinking for a while

The questions above, were they asked on SWs interviews?
Question was part of a fun game at one of my SWs
They'd give you hints if you were foundering

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6. (Original post by Aenigma)
Question was part of a fun game at one of my SWs
They'd give you hints if you were foundering

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If I had 10 minutes or so, I wouldn't mind. They're actually fun to do. Used to do riddles all the time.
7. (Original post by Anonynous)
I don't think I would've figured that out under interview pressure. I read the question like 10 times and was thinking for a while

The questions above, were they asked on SWs interviews?
It's all just about how you handle yourself under pressure and being able to think logically about what has been given. Some of the questions asked of this form don't have an exact answer, instead they care more about how you approach the question.

I'm not sure what they were for, probably summer interviews but they were mentioned on the site I've got these questions from.
8. (Original post by MathsNerd1)

You have 5 pots of coins. One of the pots contains only fake coins. The normal coins weigh 10 grams. The fake coins weigh 9 grams. You are given a weighing scales (one you would use to weigh yourself, not a balancing scales) and allowed to make only one measurement. How do you determine which pot contains the fake coins?
No idea, I've thought but all my answers require more than one measurement.
9. (Original post by Anonynous)
No idea, I've thought but all my answers require more than one measurement.
Sent you a PM
10. (Original post by Anonynous)
If any maths questions were to come up, it will be mental. Jjust stay composed, you'll be fine. All the best!
I hope so - providing I don't screw them up either, haha. Here's hoping, cheers!
11. (Original post by MathsNerd1)
Ah okay, but surely these types of questions aren't actually very mathematical, at least in my opinion they aren't.
That's why they are called brainteasers and not maths questions. I guess its to see how you think, not how well you can calculate things. Makes sense - shows how you deal with pressure as well.
12. (Original post by JackR7821)
That's why they are called brainteasers and not maths questions. I guess its to see how you think, not how well you can calculate things. Makes sense - shows how you deal with pressure as well.
That's true.
13. so anyone (or your friends, or friend's friends etc) heard anything from JP morgan (IBD spring week)? offers? rejections? interviews? horrible interview stories? heard nothing for anyone so far
14. (Original post by DavidMonk)
so anyone (or your friends, or friend's friends etc) heard anything from JP morgan (IBD spring week)? offers? rejections? interviews? horrible interview stories? heard nothing for anyone so far
Interviews have been given and rejections have started being distributed.

Questions are competency/motivation for interview.

You should hear back sometime in january. Good luck!
15. Barclays phone interview, does anyone know what dates their SW is?
16. (Original post by President M.E.)
Barclays phone interview, does anyone know what dates their SW is?
Nice when did you apply?
17. (Original post by Drossell)
Nice when did you apply?
Beginning of november
18. Has anyone received/done the Morgan Stanley final interviews?

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19. (Original post by President M.E.)
Barclays phone interview, does anyone know what dates their SW is?
jeez man, youre on fire! not sure, gl
20. (Original post by President M.E.)
Barclays phone interview, does anyone know what dates their SW is?
Solid performance Congratulations!

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