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 Post subject: Type K question, help!Posted: Sun May 29, 2011 12:04 pm

Joined: Thu Jan 20, 2011 10:52 am
Posts: 36
Hi can anyone pls tell me how to solve this question?

9(20)18 2(6)4 3( )18 ???

I don't know if it is easy and we are just overlooking something but just couldn't figure it out?

thanks

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 1:29 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
Location: caversham
alberta wrote:
Hi can anyone pls tell me how to solve this question?

9(20)18 2(6)4 3( )18 ???

I don't know if it is easy and we are just overlooking something but just couldn't figure it out?

thanks

18/2 + 9 +2 = 20

4/2 + 2 +2 = 6

18/2 + 3 +2 = 14

I would say a harder one as it involves a function (dividing second number) and adding a number not given, if that make sense.

Knowing the rules, trial and error on a piece of rough paper, or leaving it and re-visiting later sometimes works.

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 1:33 pm

Joined: Thu Jan 20, 2011 10:52 am
Posts: 36
Hi thanks for that but just checked answer sheet and answer is 24! this one seems like it's going to be a division first but a tricky one!!!

Do you think answer incorrect on answer sheet as explaination above does seem like a valid one??

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 2:20 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8762
Location: Buckinghamshire
I think the answer sheet is wrong and Steve is right. If this is multiple choice, is 14 one of the answer options?

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 2:44 pm

Joined: Thu Feb 22, 2007 2:29 pm
Posts: 593
Location: Trafford
If you use a(b)c as the format of the numbers, then c/a + c gives you the given answer.

9(20)18 18/9 + 18 = 20

2(6)4 4/2 + 4 = 6

3(?)18 18/3 + 18 = 24

Edited due to baffling formatting issues!

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 2:47 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7138
Location: East Kent
I think I would have gone with TM's method

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 3:12 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2668
The majority of these questions can be answered by keeping to the following basic rules.

Middle number has been made using the numbers either side.
Same rule must apply for all 3 sets.
Sometimes 1 operation. Sometimes 2.
Second operation can be:

1] + - x / [divide sign!] the same number.
2] doubling/halving
3] + - x / [divide sign] the number on the left or right of the middle number.

9(20)18 2(6)4 3( )18 ???

Its the 3rd rule

18 divided by 9 = 2
2 add the number on the right of the middle number = 20

4 divided by 2 = 2
2 add the number on the right of the middle number = 6

18 divided by 3 = 6
6 add the number on the right of the middle number = 24

Patricia

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 3:19 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8762
Location: Buckinghamshire
Dearie me, a roast lunch with a glass of wine. and half term brain and I am good for nothing!

I shall climb back into my teapot ...

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 Post subject: Re: Type K question, help!Posted: Sun May 29, 2011 3:40 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2668

That was me last night with an Indian Take Away and a few glasses of wine...

P

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 Post subject: Re: Type K question, help!Posted: Fri Jun 03, 2011 4:09 pm

Joined: Thu Jan 20, 2011 10:52 am
Posts: 36
Thank you everyone for all your replies!!

I am glad got to the bottom of it!! sally anne,no,14 wasn't on the answer sheet though that method made sense too!

I guess knowing the pattern now, the question seems easy but it def wasn't straight forward!!

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