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 Post subject: Help please
PostPosted: Fri Oct 07, 2011 9:55 am 
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Joined: Wed Jan 05, 2011 3:49 pm
Posts: 143
We have been looking at number questions and have managed to work out some complex ones, but one has me stumped; it is

6 [12] 18 7 [19] 12

8 [ ] 12

The answer is 10 which I can see from the first (add them togetehr and halve) but cannot get the second to tie in - help please?


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 10:05 am 
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Joined: Tue Aug 02, 2011 12:52 pm
Posts: 96
The first sequence is add together and halve 6+18=24/2=12

The second sequence is add together 7+12 = 19

The third sequence is add half together 8/2+12/2=10

Hope this helps!


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 11:24 am 
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Joined: Wed May 18, 2011 10:56 am
Posts: 215
Hi,
All 3 have to be worked out the same way, I am also puzzled with the 2nd one, have had a go.
I tried 6(12)18 6x2+18=30
minus 1st no. 6 then divide by 2=12

It works for 1st and 3rd not 2nd one.

Are the numbers correct for 2nd one?
Im sure Sally Anne or patricia will soon come along, sorry.


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 1:49 pm 
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Joined: Sat Feb 13, 2010 11:02 pm
Posts: 420
An explanation was not found last time!

viewtopic.php?f=3&t=16177

(I must stop remembering the questions :oops: :oops: )


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 2:14 pm 
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Joined: Tue Aug 02, 2011 12:52 pm
Posts: 96
New to these particular types of problem (the 9/10 age Bond books we are doing haven't got these in yet). Is my earlier explanation not right?


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 2:21 pm 
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Joined: Fri Sep 15, 2006 8:51 am
Posts: 8112
I think the instructions for the question were that you had to do the same thing to the first 2 and then apply it to the third - trouble was there didn't seem to be anything that could be done to the first 2 that would bring up the answers given (in base 10 anyway :oops: ).

The first one and the "unknown one" with answer 10 - could easily have been W"add the two and halve the answer - hence the reason why the second one doesn't look right. .... seems we have tried this none before!


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 Post subject: Re: Help please
PostPosted: Fri Oct 07, 2011 3:16 pm 
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Joined: Mon Jul 25, 2011 7:38 am
Posts: 86
It looks like an error, given that 7 + 12 = 19. For some reason, they forgot to halve it in the second case, and chose numbers which aren't divisible by two without a remainder, as well.


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