Help with this on VR please!! Baffling us all!!

Advice on 11 Plus VR papers and problems

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kittykat92
Posts: 43
Joined: Sat Jul 28, 2012 11:34 am

Help with this on VR please!! Baffling us all!!

Post by kittykat92 »

Ok so all members of family have had a go at this but just can't do it!!

2 [24] 36 3 [36] 48

5 [?] 72

Find the missing number!!!
doodles
Posts: 8300
Joined: Tue Oct 27, 2009 9:19 pm

Re: Help with this on VR please!! Baffling us all!!

Post by doodles »

60?

2x12=24
24+12=36
3x12=36
36+12=48

Then
5x12=60
60+12=72

Of course this may all be rubbish :lol:
Tagore
Posts: 121
Joined: Thu Jun 14, 2012 10:28 am

Re: Help with this on VR please!! Baffling us all!!

Post by Tagore »

Not rubbish at all Doodles! Well done in fact.
Tagore
HopefulDen
Posts: 149
Joined: Wed Apr 25, 2007 1:02 pm
Location: Birkenhead

Re: Help with this on VR please!! Baffling us all!!

Post by HopefulDen »

Strangely if you just take 12 from the number on the right you get the same
answer
Denise J
Orson
Posts: 238
Joined: Sun Jan 13, 2008 7:18 pm
Location: Gloucestershire

Re: Help with this on VR please!! Baffling us all!!

Post by Orson »

2 [24] 36 3 [36] 48

5 [?] 72

Find the missing number!!!
I believe you need to use the outside numbers to arrive at the middle number so:

(2 x 36) / (2 + 1) = 24
(3 x 48) / (3 + 1) = 36
(5 X 72) / (5 + 1) = 60
Len Scap
Posts: 7
Joined: Sat Sep 08, 2012 11:41 am

Re: Help with this on VR please!! Baffling us all!!

Post by Len Scap »

I'm reading these forums with interest to see what sort of things get asked in these tests, and I've never come across these types of problems before.

If the three numbers can be termed A and C

I take it that what the kid needs to do is (in a roundabout way) generate a method for caluclating B that uses A and C using +, -, / and x and any constants they require?

Thus for the question above we have

2 [24] 36
3 [36] 48 and
5 [x] 72

I presume they have to show working too?

Would it be ok to show it as:

b=((A+1)x12)-12

Sorry, I'm new to this!
Okanagan
Posts: 1706
Joined: Mon Aug 22, 2011 9:20 pm
Location: Warwickshire

Re: Help with this on VR please!! Baffling us all!!

Post by Okanagan »

Len Scap wrote:I presume they have to show working too?
No - just the answer
Would it be ok to show it as:
b=((A+1)x12)-12
You don't need to show how you got there - but you should be looking for an answer that uses both A and C
turtleglos
Posts: 455
Joined: Wed Jul 07, 2010 12:04 pm

Re: Help with this on VR please!! Baffling us all!!

Post by turtleglos »

Hi, no they just have to mark the right box. Of course they have to be able to work out the answer in order to that so they do need to be familiar with the question type and able to look at numbers logically. Lots of practice ahead of time will help.
Everyone is a genius, but if you judge a fish by its ability to climb a tree, it will think it is stupid.
Len Scap
Posts: 7
Joined: Sat Sep 08, 2012 11:41 am

Re: Help with this on VR please!! Baffling us all!!

Post by Len Scap »

Okanagan wrote:
Len Scap wrote:I presume they have to show working too?
No - just the answer
Would it be ok to show it as:
b=((A+1)x12)-12
You don't need to show how you got there - but you should be looking for an answer that uses both A and C
Ok - thanks.

I actually ended up with two equations:

c=(a+1)x12 and
b = c-12

I just substituted to get to b=((a+1)x12)-12, but I used a and c to get there.
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