## Welcome to BrainDen.com - Brain Teasers Forum

 Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account. As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends. Of course, you can also enjoy our collection of amazing optical illusions and cool math games. If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top. If you have a website, we would appreciate a little link to BrainDen. Thanks and enjoy the Den :-)
Guest Message by DevFuse

# Biology

76 replies to this topic

### #21 Naruki

Naruki

Junior Member

• Members
• 25 posts

Posted 23 July 2007 - 12:04 PM

Is that better? Or, are you bio nerds going to attack this riddle too?

Well, I'm not a bio nerd, but your riddle is exactly the same as the previous one. Flies gotta eat to reproduce.

How about this?

Big Tony has loaned you 1 penny at 100% interest, compounded minutely (time, not size).

When the amount you have to pay back exceeds your yearly pre-tax salary (you make 100,000 \$/year), he will come in to break your legs.

A few seconds after 12:00:00, he came in with a baseball bat and 3 goons. When did he loan you the penny?
• 0

### #22 Naruki

Naruki

Junior Member

• Members
• 25 posts

Posted 23 July 2007 - 12:11 PM

WHOOPS! A couple of big mistakes.

1) My riddle is for a completely different solution. I'm asking for the start time, not the "half full" time.

2) The original riddle is fatally flawed. Even if we accept the intended "magical reproduction at same size, each minute" rule as a given, we still don't know when the saucer gets half full!

The reason being that we don't know the size of the cells nor the size of the saucer, both of which are absolutely essential to answering this question. For example:

Suppose the saucer can hold exactly 10 cells.
After 1 minute, the saucer has 2 cells, but is not half full.
After 2 minutes, 4 cells, but is not half full.
After 3 minutes, 8 cells, more than half but not completely full.
After 4 minutes, completely full.
• 0

### #23 heatherb1207

heatherb1207

Newbie

• Members
• 6 posts

Posted 24 July 2007 - 08:44 AM

I think it would be half-full at 11:59, because then at the next minute (12:00) assuming that 12:00 isn't minute and seconds, but noon or midnight since when half is doubled it makes a whole. If in fact it's not hours and minutes, but minutes and seconds (like on a stop watch), the correct answer would then be 11:00.
• 0

### #24 Teridann

Teridann

Newbie

• Members
• 1 posts

Posted 24 July 2007 - 08:18 PM

11:59 Within the contraints of the riddle, the organisms double in number every minute. At 11:59 it was half-full, doubled in size and the saucer was completely full at 12:00.
• 0

### #25 Naruki

Naruki

Junior Member

• Members
• 25 posts

Posted 25 July 2007 - 02:37 PM

11:59 Within the contraints of the riddle, the organisms double in number every minute. At 11:59 it was half-full, doubled in size and the saucer was completely full at 12:00.

Unless it went from 40% full to 80% full with no stop at 50% full.
• 0

### #26 rhalpern

rhalpern

Newbie

• Members
• 4 posts

Posted 26 July 2007 - 05:08 PM

The minute before (11:59)
• 0

### #27 erictheread

erictheread

Newbie

• Members
• 9 posts

Posted 10 August 2007 - 04:40 PM

1 minute ago
• 0

### #28 Argetlam42

Argetlam42

Newbie

• Members
• 3 posts

Posted 24 August 2007 - 06:06 AM

To find when it's full, you need to know both the size of the saucer and the microorganism. So this teaser is impossible.
• 0

### #29 tweak4

tweak4

Newbie

• Members
• 7 posts

Posted 30 August 2007 - 05:08 PM

To find when it's full, you need to know both the size of the saucer and the microorganism. So this teaser is impossible.

No, you do not. You are told in the premise that the dish is full at noon. Assuming that means that noon is the time when the dish was first considered to be full (a fair assumption given the spirit of the riddle), the only possible answer is 11:59. 1 minute ago, and just before the final division that resulted in the dish being considered "full". The size of the cells and that of the dish are completely irrelevant.
• 0

### #30 Naruki

Naruki

Junior Member

• Members
• 25 posts

Posted 01 September 2007 - 04:23 AM

No, you do not. You are told in the premise that the dish is full at noon. Assuming that means that noon is the time when the dish was first considered to be full (a fair assumption given the spirit of the riddle), the only possible answer is 11:59. 1 minute ago, and just before the final division that resulted in the dish being considered "full". The size of the cells and that of the dish are completely irrelevant.

And you didn't read many of the other replies, or you'd understand why you are wrong in your "the only possible answer" assertion.
• 0

#### 0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users