Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.

Maths Brain Teaser

22 replies to this topic

#1 Beaker77

Beaker77

• Members
• 180 posts
• OFFLINE
•
• Gender:Male
• Local time:08:52 PM

Posted 06 June 2018 - 08:17 AM

The  figure shown consists of a rectangle and the numbers labelled over the top represents the area of that particular shaded region.

Calculate the area of the green region labelled as '?'

I cannot find an answer which agrees with that provided, can you solve it ?

.

#2 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 09:21 AM

Are any other dimensions given?  What does the 2 and the 3 stand for?

Edited by Orange Blossom, 06 June 2018 - 09:21 AM.

Orange Blossom

An ounce of prevention is worth a pound of cure

SpywareBlaster, WinPatrol Plus, ESET Smart Security, Malwarebytes' Anti-Malware, NoScript Firefox ext., Norton noscript

#3 Beaker77

Beaker77
• Topic Starter

• Members
• 180 posts
• OFFLINE
•
• Gender:Male
• Local time:08:52 PM

Posted 06 June 2018 - 10:10 AM

No, just as I show it, together with the script.

I cannot solve it, even given the official answer.

I am looking for a genius on BC who may be able to.

I will obviously give the answer they give if nobody comes up with the "correct" answer.

Quite honestly I think the information given is not sufficient.

Edited by Beaker77, 06 June 2018 - 10:10 AM.

#4 Condobloke

Condobloke

Outback Aussie @ 54.2101° N, 0.2906° W

• Members
• 6,082 posts
• OFFLINE
•
• Gender:Male
• Local time:05:52 AM

Posted 06 June 2018 - 10:37 AM

5.5

Condobloke ...Outback Australian  fed up with Windows antics...??....LINUX IS THE ANSWER....I USE LINUX MINT 18.3  EXCLUSIVELY.

“A man travels the world in search of what he needs and returns home to find it."

It has been said that time heals all wounds. I don't agree. The wounds remain. Time - the mind, protecting its sanity - covers them with some scar tissue and the pain lessens, but it is never gone. Rose Kennedy

#5 Beaker77

Beaker77
• Topic Starter

• Members
• 180 posts
• OFFLINE
•
• Gender:Male
• Local time:08:52 PM

Posted 06 June 2018 - 10:40 AM

5.5

PLEASE explain to me how you got that answer.​ 5.5 is correct as given, but under suspicion as being wrong. This puzzle is baffling a lot of people including me.

I would add that the Internet answer given looks completely wrong. So if the 5.5 is simply a look-up, then it is wrong.

Edited by Beaker77, 06 June 2018 - 10:52 AM.

#6 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 11:13 AM

Here is as far as I get with my thinking.

The area of blue + white = the area of green plus that brownish red.

The area of the blue and the brownish red, which is 2 +  3 = 5 = the area of a right triangle.

The area of a triangle = 1/2 the base times the height.  If we could determine the perimeter from the 2 + 3 figures and thus determine the lengths of the triangle sides, I'm thinking we could then determine other values.

Orange Blossom

An ounce of prevention is worth a pound of cure

SpywareBlaster, WinPatrol Plus, ESET Smart Security, Malwarebytes' Anti-Malware, NoScript Firefox ext., Norton noscript

#7 Beaker77

Beaker77
• Topic Starter

• Members
• 180 posts
• OFFLINE
•
• Gender:Male
• Local time:08:52 PM

Posted 06 June 2018 - 11:23 AM

Here is as far as I get with my thinking.

The area of blue + white = the area of green plus that brownish red.

The area of the blue and the brownish red, which is 2 +  3 = 5 = the area of a right triangle.

The area of a triangle = 1/2 the base times the height.  If we could determine the perimeter from the 2 + 3 figures and thus determine the lengths of the triangle sides, I'm thinking we could then determine other values.

I like it Orange Blossom, logical, but how does it result in the green area  = 5.5 ?

#8 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 11:53 AM

I don't know.  As I said, that was as far as I got in my thinking.

Orange Blossom

An ounce of prevention is worth a pound of cure

SpywareBlaster, WinPatrol Plus, ESET Smart Security, Malwarebytes' Anti-Malware, NoScript Firefox ext., Norton noscript

#9 The-Toolman

The-Toolman

• Members
• 1,441 posts
• OFFLINE
•
• Gender:Male
• Local time:02:52 PM

Posted 06 June 2018 - 12:33 PM

Perhaps this offers a solution.

https://en.wikipedia.org/wiki/Right_triangle

Edited by The-Toolman, 06 June 2018 - 12:33 PM.

I'm grumpy because I can be not because I'm old.

The world is what you make of it, if it doesn't fit, you make alterations.

Under certain circumstances, profanity provides a relief denied even to prayer.  (Mark Twain)

#10 JohnC_21

JohnC_21

• Members
• 24,443 posts
• ONLINE
•
• Gender:Male
• Local time:03:52 PM

Posted 06 June 2018 - 01:39 PM

I still don't get why the white is 3*(3/2). It's all based on similar triangles and ratios.

http://gpuzzles.com/mind-teasers/mathematical-picture-area-problem/

#11 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 05:23 PM

The white CAN'T be 3.  The blue is 3 and it's easy to see that the area of the blue is smaller than the area of the white.  White must be larger than 3.

Orange Blossom

An ounce of prevention is worth a pound of cure

SpywareBlaster, WinPatrol Plus, ESET Smart Security, Malwarebytes' Anti-Malware, NoScript Firefox ext., Norton noscript

#12 JohnC_21

JohnC_21

• Members
• 24,443 posts
• ONLINE
•
• Gender:Male
• Local time:03:52 PM

Posted 06 June 2018 - 05:44 PM

White is not 3 according to the comments. It's 3*(3/2) or 9/2 or 4.5 then + 3 for the blue and -2 for the red gives 5.5.

#13 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 06:03 PM

I wonder how they arrive at that for the white area.  Blue and red have different heights and bases, whatever they are.

It's true that red and white mirror the angles of each other, but we don't know what those angles are, and even if we did, we don't know what any lengths are to calculate areas.

Orange Blossom

An ounce of prevention is worth a pound of cure

SpywareBlaster, WinPatrol Plus, ESET Smart Security, Malwarebytes' Anti-Malware, NoScript Firefox ext., Norton noscript

#14 Chris Cosgrove

Chris Cosgrove

• Moderator
• 7,007 posts
• ONLINE
•
• Gender:Male
• Location:Scotland
• Local time:08:52 PM

Posted 06 June 2018 - 06:06 PM

42 ?

Chris Cosgrove

I am going to be away until about the 22nd October. Time on-line will be reduced and my internet access may be limited. PMs may not be replied to as quickly as normal !

#15 Orange Blossom

Orange Blossom

OBleepin Investigator

• Moderator
• 37,011 posts
• OFFLINE
•
• Gender:Not Telling
• Location:Bloomington, IN
• Local time:03:52 PM

Posted 06 June 2018 - 06:59 PM

And how do you arrive at that Chris?