Hard or Easy Maths Question... 4unit class come solve it (1 Viewer)

[conics2008]

The figure below shows a rectangle 15 cm by 6 cm. The area of Triangle A
is 4 cm2 and the area of Triangle B is 16 cm2.


What is the area of Rectangle C?


This is a test, I am not responsible for any stress caused by this question. This is a test of faith. Do you have faith in you're self or in maths..........



GOOD LUCK !!!!.. This is actually from an exam paper. I didn't make this up.



EDIT: Think about it very carefully, the answer might shock you !!!!

 

[Affinity]

If you claim that PQRS is 15 by 6 then something is wrong.

 

[tacogym27101990]

is the answer 15???
im not sure
coz i just proved conguency in triangles QUX and QVX
then found the area of QRS which i found to be 45
then subtracted triangle A and triangle B away from it??

 

[conics2008]

why would u assume something is wrong..... ?????????

 

[lyounamu]

The figure below shows a rectangle 15 cm by 6 cm. The area of Triangle A
is 4 cm2 and the area of Triangle B is 16 cm2.


What is the area of Rectangle C?


This is a test, I am not responsible for any stress caused by this question. This is a test of faith. Do you have faith in you're self or in maths..........



GOOD LUCK !!!!.. This is actually from an exam paper. I didn't make this up.




EDIT: Think about it very carefully, the answer might shock you !!!!

You sure your diagram is right?? I can't get the answer right. I got the all the ratios and everything right. But it is just not right...

I got 20 as my answer by the way... according to my working out but it doesn't satisfy that A = 4 and B =16....

 

[lyounamu]

is the answer 15???
im not sure
coz i just proved conguency in triangles QUX and QVX
then found the area of QRS which i found to be 45
then subtracted triangle A and triangle B away from it??

I used the similar method and got into wrong answer.... WTH??

 

[conics2008]

You sure your diagram is right?? I can't get the answer right. I got the all the ratios and everything right. But it is just not right...

I got 20 as my answer by the way... according to my working out but it doesn't satisfy that A = 4 and B =16....

yeap spot on =) describe how it doesn't satisfy area =4 and area = 16

 

[lyounamu]

yeap spot on =) describe how it doesn't satisfy area =4 and area = 16

Didn't catch what you meant... I got it right??? Or what?

 

[tacogym27101990]

I used the similar method and got into wrong answer.... WTH??

haha your probably right then
i wouldnt trust my maths in my head
i have dyspraxia
so i fuck up even simple calculations in my head

 

[conics2008]

Didn't catch what you meant... I got it right??? Or what?

You're bright =).. you got 1 tick from me, you said it doesn't match with 4 and 16.. have you thought about what might be the lengths of the sides .....


There is an issue with this question. I've got the answer.. ill post it later =)

 

[conics2008]

haha your probably right then
i wouldnt trust my maths in my head
i have dyspraxia
so i fuck up even simple calculations in my head

hahaha.. you dont trst ya self.. dw i dont trust my self sometimes too =) ...

 

[tacogym27101990]

hahaha.. you dont trst ya self.. dw i dont trust my self sometimes too =) ...

haha i trust myself in maths when ive got a calculator
but the fucking dyspraxia makes it hard for me to remember some timestables from the ones like 11 and 7 and stuff
im getting better tho slowly

 

[conics2008]

Tacgym welcome, me and you are on the same boat. LoL....

I can't plus, minus divide 4 shit lol... Once in an exam there was an easy question.. everybody got it except me.. lol how embrassing, teacher said what happend you got all the question right and the hardest one of them but you can't manage to do the simple question lol.. if i knew how to solve that simple percentage problem i would of got 100% =( lol....


im sad lol.... if it wasn't for the calculator i would of failed 4unit, 3unit and including 2unit lol.... but thanks to the calculator im still in the 95+ in maths =)

 

[lyounamu]

Tacgym welcome, me and you are on the same boat. LoL....

I can't plus, minus divide 4 shit lol... Once in an exam there was an easy question.. everybody got it except me.. lol how embrassing, teacher said what happend you got all the question right and the hardest one of them but you can't manage to do the simple question lol.. if i knew how to solve that simple percentage problem i would of got 100% =( lol....


im sad lol.... if it wasn't for the calculator i would of failed 4unit, 3unit and including 2unit lol.... but thanks to the calculator im still in the 95+ in maths =)

That's totally opposite of what I really am. I rarely use calculator. It slows me down when I am working out. I can easily to xx times xx or xx divided by xx. I am used to calculating without calculator.

I wish they give me questions where I don't need to use calculator.

 

[conics2008]

That's totally opposite of what I really am. I rarely use calculator. It slows me down when I am working out. I can easily to xx times xx or xx divided by xx. I am used to calculating without calculator.

I wish they give me questions where I don't need to use calculator.

xD.. In 4unit you pretty much not use a calculator but im hopeless without it...

http://www.math.nus.edu.sg/aslaksen/papers/PSLE2005.pdf here is the answer. read the full answer xD... =) what school you go to ?

 

[lyounamu]

xD.. In 4unit you pretty much not use a calculator but im hopeless without it...

http://www.math.nus.edu.sg/aslaksen/papers/PSLE2005.pdf here is the answer. read the full answer xD... =) what school you go to ?

That's pretty complicated working out, actually. Thanks for the answer by the way, it was cool and cleared up all my doubt.

I go to St Piux X College (SPX), the best school on the north shore. Teachers are great, students are great and it's pretty academic as well.

 

[tacogym27101990]

hahahahaha here we go
perfect example.
according to my brain:
45-20=15!!!!

o well atleast i worked it out correct
and in a test id have a calc
even if the question was wrong

 

[Slidey]

I didn't bring a calculator into the 4unit HSC external exam.

Didn't end up needing one either. Such is the nature of 4unit.

 

[tacogym27101990]

I didn't bring a calculator into the 4unit HSC external exam.

Didn't end up needing one either. Such is the nature of 4unit.

Damn you!!!
wish i could do that
it would save soooo much time

 

[Affinity]

calculators save you no time in the 4 unit exam