Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 | 3 | 4 | 5
6502 posts

Uber Geek
+1 received by user: 517

Trusted

  Reply # 1421321 5-Nov-2015 06:54
Send private message

eracode: 


F*** you, Mitsubishi. I don't like your cars anyway.



That was pretty much my answer also...

17467 posts

Uber Geek
+1 received by user: 2118

Trusted

  Reply # 1421331 5-Nov-2015 07:32
Send private message

Easy. But these aren't maths??? More like IQ test?

 
 
 
 


380 posts

Ultimate Geek
+1 received by user: 362


  Reply # 1421410 5-Nov-2015 09:30
Send private message

MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)

IT Professional
1703 posts

Uber Geek
+1 received by user: 166

Trusted
Subscriber

  Reply # 1421424 5-Nov-2015 09:51
Send private message

the dress is definitely white and gold!! (not blue and black) wink


Oh, wrong question laughing

5040 posts

Uber Geek
+1 received by user: 2318


  Reply # 1421464 5-Nov-2015 10:28
Send private message

surfisup1000:
Jaxson: This took me about 10 seconds.  How is this difficult?

That may sound knoby but I found that china (?) car parking sequence one WAY more difficult, and that was for 7 year olds...



87, not really a math question though.  More a psychological trick. 


And experience...
I used to spend a lot of time in business meetings.  Learning to quickly read text upside-down is a valuable negotiating skill. 

1310 posts

Uber Geek
+1 received by user: 652


  Reply # 1421600 5-Nov-2015 12:33
One person supports this post
Send private message

6FIEND:
MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)


Surely that just goes to a quadratic equation which can be solved by the standard formula (answer =12)?

935 posts

Ultimate Geek
+1 received by user: 179


  Reply # 1421647 5-Nov-2015 13:02
Send private message

shk292:
6FIEND:
MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)


Surely that just goes to a quadratic equation which can be solved by the standard formula (answer =12)?
Not everyone can form that equation geometrically, some may struggle with algebraic expressions like the 12-d/2.
For me I see it as the area of the outer 12-by-d rectangle minus the area of the triangle (as area of triangle is half that of rectangle 1/2*base*height)

6502 posts

Uber Geek
+1 received by user: 517

Trusted

  Reply # 1421650 5-Nov-2015 13:06
One person supports this post
Send private message

shk292:
6FIEND:
MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)


Surely that just goes to a quadratic equation which can be solved by the standard formula (answer =12)?



I'd approach it as Total area 108 m^2 is created by the area of the square plus the area of the Triangle.

So:

Area of the Square is d times (12-d/2)

plus

Area of the triangle is (d times (12m - (12-d/2))) / 2

=

108

 

 

 

 

 

So multiply that lot out, make d the subject and therefore solve for d?

BTR

1342 posts

Uber Geek
+1 received by user: 357

Subscriber

  Reply # 1421657 5-Nov-2015 13:12
Send private message

I failed School cert maths with 35% and I still got it right.......

1310 posts

Uber Geek
+1 received by user: 652


  Reply # 1421691 5-Nov-2015 14:06
Send private message

Jaxson:
shk292:
6FIEND:
MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)


Surely that just goes to a quadratic equation which can be solved by the standard formula (answer =12)?



I'd approach it as Total area 108 m^2 is created by the area of the square plus the area of the Triangle.

So:

Area of the Square is d times (12-d/2)

plus

Area of the triangle is (d times (12m - (12-d/2))) / 2

=

108     So multiply that lot out, make d the subject and therefore solve for d?

Yep, it comes out as d^2 -48d +432 = 0, and you can apply the standard quadratic formula from there

14928 posts

Uber Geek
+1 received by user: 3819

Trusted
Subscriber

  Reply # 1421729 5-Nov-2015 15:24
Send private message

Initially my eyes popped out of my head, but thinking about it for a minute, I worked out how I might get the answer, then I did the calculations and the answer I got was one from the list, then I looked at the angle and used estimation to work out if 6 of those gaps would make a circle, and I knew it was right. 

It's an issue someone mentioned to me recently that people these days have lost the ability to ESTIMATE, which affects their ability to check if something is more or less right. 

I can't agree more now that I have seen so many instances of it since then!

I probably wouldn't have got it at 15/16 as at school I had a mental block at math, I failed it twice. 

2320 posts

Uber Geek
+1 received by user: 532

Subscriber

  Reply # 1421735 5-Nov-2015 15:39
Send private message

shk292:
Jaxson:
shk292:
6FIEND:
MadEngineer: I had this question from when I studied NZCE


That's a much more appropriate question to "test" students with IMHO :-)

(BTW, I have determined the answer, but I haven't found an "elegant" way to solve it)


Surely that just goes to a quadratic equation which can be solved by the standard formula (answer =12)?



I'd approach it as Total area 108 m^2 is created by the area of the square plus the area of the Triangle.

So:

Area of the Square is d times (12-d/2)

plus

Area of the triangle is (d times (12m - (12-d/2))) / 2

=

108     So multiply that lot out, make d the subject and therefore solve for d?

Yep, it comes out as d^2 -48d +432 = 0, and you can apply the standard quadratic formula from there



I also found that the total area ended up as that quadratic equation but it took me a while, using trial and error, to find the correct common factors of -48 and +432.

BTW - the rectangle in the diagram looks like a square but clearly it's not.

1439 posts

Uber Geek
+1 received by user: 341


  Reply # 1421937 5-Nov-2015 19:42
Send private message

It's not a square.

108m^2 is the total area of the whole shape.

2320 posts

Uber Geek
+1 received by user: 532

Subscriber

  Reply # 1421941 5-Nov-2015 19:55
Send private message

MadEngineer: It's not a square.
.


As I had just said.

2332 posts

Uber Geek
+1 received by user: 367

Trusted

  Reply # 1421979 5-Nov-2015 21:05
Send private message

long story.. but..

there are 2 answers...
12 and 36

Lets work it out..

Rectangle and Triangle

d(12−0.5d)+2(0.5(0.5d(0.5)d))=108  
−0.25d2+12d−108=0

Use some quadratic formula (a little hard to display here)

d=12 and 36

Of course the image is nothing like that the imaginary shape as the triangle has a negative size or the rectangle does.

(or I got it complete wrong) :-)


 






1 | 2 | 3 | 4 | 5
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

From small to medium and beyond: Navigating the ERP battlefield
Posted 21-Nov-2017 21:12


Business owners: ERP software selection starts (and finishes) with you
Posted 21-Nov-2017 21:11


Why I'm not an early adopter
Posted 21-Nov-2017 10:39


Netatmo launches smart home products in New Zealand
Posted 20-Nov-2017 20:06


Huawei Mate 10: Punchy, long battery life, artificial intelligence
Posted 20-Nov-2017 16:30


Propel launch Disney Star Wars Laser Battle Drones
Posted 19-Nov-2017 21:26


UFB killer app: Speed
Posted 17-Nov-2017 17:01


The case for RSS — MacSparky
Posted 13-Nov-2017 14:35


WordPress and Indieweb: Take control of your online presence — 6:30 GridAKL Nov 30
Posted 11-Nov-2017 13:43


Chorus reveals technology upgrade for schools, students
Posted 10-Nov-2017 10:28


Vodafone says Internet of Things (IoT) crucial for digital transformation
Posted 10-Nov-2017 10:06


Police and Facebook launch AMBER Alerts system in NZ
Posted 9-Nov-2017 10:49


Amazon debuts Fire TV Stick Basic Edition in over 100 new countries
Posted 8-Nov-2017 05:34


Vodafone VoIP transition to start this month
Posted 7-Nov-2017 12:33


Spark enhances IoT network capability
Posted 7-Nov-2017 11:33



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.