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 Post subject: Number series
PostPosted: Fri Apr 20, 2012 9:39 am 
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Joined: Tue Sep 27, 2011 1:21 pm
Posts: 67
Hello,
My dd came across one of the number series
11 14 22 16 __ __
It is standard format paper so there is no possibility of looking in multiple options.
she thinks it is two series running together with the answers being 44 and 18
11 22 44.........double the previous number
14 16 18.........+4 to previous number
But the answer is 33 and 18
my trouble is there no reason for the answer not to be 44 with her explanation.....
she says to prove it to bee 33 they should give series a bit longer to be obvious that it is 11 times table....
Do these unclear questions appear in actual test and if they do both the answers are considered correct?
Please help....


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 Post subject: Re: Number series
PostPosted: Fri Apr 20, 2012 10:17 am 
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Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8199
Location: Buckinghamshire
It is an ambiguous question. The real tests (depending upon the school/area) are usually very carefully proof-read to iron out any ambiguities like this. I can only recall one occasion when an error was identified on a real paper - a few years ago in Herts.


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 9:57 am 
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Joined: Mon Apr 09, 2012 7:56 am
Posts: 125
hello all

How do you know which sequence to use on these sort of questions.?

22, 21, 23, 23, 24, 25, 25 (....)

The way I look into this is that you can go both ways...22 to 23, 23 to 24, 24 to 25

Alternatively, use 21 instead but then it jumps by 2..21 to 23, 23 to 25 and so on

Answer is 27 but why ??

Also I have one more:-

93, 92, 95, 95, 97, 98 (...)

Answer is 99 but why?

Many Thanks !


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:06 am 
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Joined: Mon Dec 05, 2011 5:44 pm
Posts: 357
22 21 23 23 24 25 25

every other number ncreasing by one

22 23 24 25

every other number increasing by two

21 23 25 27


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:07 am 
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Joined: Mon Dec 05, 2011 5:44 pm
Posts: 357
93 92 95 95 97 98

93 95 97 ... 99

every other number increasing by two

92 95 98

every other number increasing by three


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:17 am 
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Joined: Mon Apr 09, 2012 7:56 am
Posts: 125
faitaccompli wrote:
93 92 95 95 97 98

93 95 97 ... 99

every other number increasing by two

92 95 98

every other number increasing by three


So surely answer could be 99 or 101...how do you know which one to use or am i having a blond moment here ?


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:35 am 
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Joined: Mon Dec 05, 2011 5:44 pm
Posts: 357
Because it is in sequence - so it needs to match the penultimate number in the list.

ie.

93 92 95 95 97 98 99


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:46 am 
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Joined: Mon Apr 09, 2012 7:56 am
Posts: 125
faitaccompli wrote:
Because it is in sequence - so it needs to match the penultimate number in the list.

ie.

93 92 95 95 97 98 99


ok, but then both sequences would give you 101 not 99 and the answer is 99 on the answers ??


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 10:53 am 
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Joined: Mon Dec 05, 2011 5:44 pm
Posts: 357
Manny0311 wrote:
faitaccompli wrote:
Because it is in sequence - so it needs to match the penultimate number in the list.

ie.

93 92 95 95 97 98 99


ok, but then both sequences would give you 101 not 99 and the answer is 99 on the answers ??



The number in bold and underscored is the missing number! so the original sequence was

93, 92, 95, 95, 97, 98, ?


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 Post subject: Re: Number series
PostPosted: Sun Apr 22, 2012 8:29 pm 
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Joined: Sun Jan 13, 2008 6:18 pm
Posts: 238
Location: Gloucestershire
Going backwards from the question mark every other number goes down by 2, i.e. 97, 95, 93, ... So the preceding number (the question mark) was 99.
The number after 99 would be 101 because every other number preceding it goes up by 3, i.e. 92, 95, 98, ... However, you are not required to give this number.


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