need explanation
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need explanation
Letts Paper C Question 53
TT Paper 11 Question 54
TT Paper 11 Question 54
Re: need explanation
It would be helpful if you write out the question.
Patricia
Patricia
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Re: need explanation
Letts, Test C - Q53:kavitag wrote:Letts Paper C Question 53
TT Paper 11 Question 54
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.
Re: need explanation
Thx a lot... I got it u r right with the first explanation.
Re: need explanation
( 15 [ 18 ] 9 ) ( 17 [ 39 ] 4 )
( 20 [ ? ] 9 )
Ans is : 33 Dont know how?
( 20 [ ? ] 9 )
Ans is : 33 Dont know how?
Re: need explanation
Middle number is (1st no - 2nd no)*3 i.e.20 - 9 =11; x3 = 33kavitag wrote:( 15 [ 18 ] 9 ) ( 17 [ 39 ] 4 )
( 20 [ ? ] 9 )
Ans is : 33 Dont know how?
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