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 Post subject: need explanation
PostPosted: Tue Aug 27, 2013 12:16 pm 
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Joined: Thu Jun 14, 2012 8:51 pm
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Letts Paper C Question 53
TT Paper 11 Question 54


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 12:32 pm 
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It would be helpful if you write out the question.

Patricia


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 1:01 pm 
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Please always helps too :)


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 6:02 pm 
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kavitag wrote:
Letts Paper C Question 53
TT Paper 11 Question 54


Letts, Test C - Q53:

First of all there are two seperate sequences going on in this question.

66, 1, 61, 2, 51, 4, ?

I wasn't entirely sure because I thought the answer could be be 36 as well. However I do think I have an explanation for why the answer is 31 as given in the answer booklet.

1st Sequence - 66, 61, 51:

*Main pattern:

66 - 5 = 61
61 - 10 = 51
51 - 20 = 31

*Pattern within the difference

-5 x 2 = -10
-10 x 2 = -20

I thought the pattern initially was -5, -10, -15 which is how I got 36 the first time round. But I guess first you have to work out the difference and then find another pattern within the difference.

2nd Sequence - 1, 2, 4:

*Main pattern:

1 + 1 = 2
2 + 2 = 4
4 + 4 = 8

*Pattern within the difference:

+1 x 2 = 2
+2 x 2 = 4

I think this indicates that you had to multiply the difference by two in the first sequence? I'm not too sure sorry.


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 8:37 pm 
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Joined: Thu Jun 14, 2012 8:51 pm
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Thx a lot... I got it u r right with the first explanation.


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 8:51 pm 
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Joined: Thu Jun 14, 2012 8:51 pm
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( 15 [ 18 ] 9 ) ( 17 [ 39 ] 4 )

( 20 [ ? ] 9 )


Ans is : 33 Dont know how?


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 Post subject: Re: need explanation
PostPosted: Tue Aug 27, 2013 8:55 pm 
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Joined: Wed Jan 18, 2012 11:41 am
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kavitag wrote:
( 15 [ 18 ] 9 ) ( 17 [ 39 ] 4 )

( 20 [ ? ] 9 )


Ans is : 33 Dont know how?


Middle number is (1st no - 2nd no)*3 i.e.20 - 9 =11; x3 = 33

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 Post subject: Re: need explanation
PostPosted: Wed Aug 28, 2013 10:09 am 
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Joined: Thu Jun 14, 2012 8:51 pm
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Thx a lottttt Toadmum


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