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 Post subject: help with question, type 21 or z. logic inferencePosted: Wed Aug 22, 2012 7:49 pm

Joined: Sun Aug 19, 2012 7:36 pm
Posts: 14
Hi, I have spent over an hour trying to solve a question=one of the logic types.
The books tend to suggest to use a grid to solve these type of questions, but don't know where to start with this question. Feeling a bit daft as in the book it should be done within 6 mins and there are two other completely separate questions.
Here is the question.

Kasim and Neil have 39 stickers between them; Neil and Carla have 44 stickers and the children have a total of 65 stickers.
How many stickers does Kasim have?
How many stickers does Carla have?
How many stickers do Carla and Kassim have between them?
I would be really interested to know how it is worked out-I know it must be rediculously simple but I just don't get it!

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 Posted: Wed Aug 22, 2012 7:57 pm

Joined: Wed Mar 09, 2011 2:22 pm
Posts: 710
goldengirl wrote:
Hi, I have spent over an hour trying to solve a question=one of the logic types.
The books tend to suggest to use a grid to solve these type of questions, but don't know where to start with this question. Feeling a bit daft as in the book it should be done within 6 mins and there are two other completely separate questions.
Here is the question.

Kasim and Neil have 39 stickers between them; Neil and Carla have 44 stickers and the children have a total of 65 stickers.
How many stickers does Kasim have?
How many stickers does Carla have?
How many stickers do Carla and Kassim have between them?
I would be really interested to know how it is worked out-I know it must be rediculously simple but I just don't get it!

Presumably, there are 3 children.
If Kasim and Neil have 39 between them and there are 65 in total, Carla must have 65-39=26.
Neil must have 44-26=18.
Kasim must have 21.

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 Posted: Wed Aug 22, 2012 8:02 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
Quote:
Kasim and Neil have 39 stickers between them; Neil and Carla have 44 stickers and the children have a total of 65 stickers.
How many stickers does Kasim have?
How many stickers does Carla have?
How many stickers do Carla and Kassim have between them?

From the first two statements we know Carla must have 5 stickers more than Kasim

So Kasim + Neil + (Kasim + 5 ie Carla) = 65

and Kasim + Neil is 39 so Kasim has 21

If Kasim has 21 then Neil has 18 (to get 39 between them) so Carla has 26 (5 more than K)

Writing it down is more complicated than doing it but hope you can follow

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 Posted: Thu Aug 23, 2012 10:31 pm

Joined: Sun Aug 19, 2012 7:36 pm
Posts: 14
Hi=thanks to both of you. It makes sense now!

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 Posted: Sat Sep 08, 2012 4:12 pm

Joined: Sat Sep 08, 2012 10:41 am
Posts: 7
Sorry if I'm resurectting old posts - just seeing what is needed in these tests!

I remember as a kid that these questions always had kids with names beginning with different letters, so to me it seemed they were begging you to use algebra.

The question is:
Kasim and Neil have 39 stickers between them; Neil and Carla have 44 stickers and the children have a total of 65 stickers.
How many stickers does Kasim have?
How many stickers does Carla have?
How many stickers do Carla and Kassim have between them?

I'd re-write that as:

K+N=39
N+C=44
K+N+C=65
Find the values of K, N and C

To me this makes it much more simple to work out - although it's the same method as has been explained earlier, it's just clearer to work with.

You can substitute in the values you know now.

K+N+C = 65, you can write
K+44=65 (because we know that N+C=44)
re-arange to get
K=65-44
K=21

plug that value back in:
K+N=39
21+N=39
N=39-21
N=18

plug that value back in:
K+N+C=65
21+18+C=65
C=65-21-18
C=26

My brain is much more able to deal with the question done that way, so I've posted in case it helps any of your kids.

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