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
6642 posts

Uber Geek
+1 received by user: 552

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...

Mad Scientist
18461 posts

Uber Geek
+1 received by user: 2340

Trusted
Lifetime subscriber

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

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

564 posts

Ultimate Geek
+1 received by user: 484


  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)

1709 posts

Uber Geek
+1 received by user: 169

Trusted

  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

6414 posts

Uber Geek
+1 received by user: 3230


  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. 

1474 posts

Uber Geek
+1 received by user: 741


  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)?

1187 posts

Uber Geek
+1 received by user: 265


  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)

6642 posts

Uber Geek
+1 received by user: 552

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

1461 posts

Uber Geek
+1 received by user: 427


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

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

1474 posts

Uber Geek
+1 received by user: 741


  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

17119 posts

Uber Geek
+1 received by user: 4855

Trusted
Lifetime 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. 

2580 posts

Uber Geek
+1 received by user: 672

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.

1531 posts

Uber Geek
+1 received by user: 379


  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.

2580 posts

Uber Geek
+1 received by user: 672

Subscriber

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

MadEngineer: It's not a square.
.


As I had just said.

2350 posts

Uber Geek
+1 received by user: 373

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 »

N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34


Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07


All or Nothing: New Zealand All Blacks arrives on Amazon Prime Video
Posted 2-Jun-2018 16:21


Innovation Grant, High Tech Awards and new USA office for Kiwi tech company SwipedOn
Posted 1-Jun-2018 20:54


Commerce Commission warns Apple for misleading consumers about their rights
Posted 30-May-2018 13:15


IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12


New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17


Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41



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.