It is currently Tue Jan 16, 2018 11:42 pm

 All times are UTC

 Page 1 of 2 [ 19 posts ] Go to page 1, 2  Next
 Print view Previous topic | Next topic
Author Message
 Post subject: Help please :)Posted: Thu Aug 30, 2012 10:21 am

Joined: Tue May 29, 2012 8:16 pm
Posts: 57
Hi everyone, you helped me before with a math sum so was hoping if you could help again.

There are 4 cards with the numbers, 7, 5, 2, 3.

Using each card only once, make the smallest possible multiple of 6.

I think I am missing something obvious but I'm having a thick day

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 10:31 am

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8539
7 5 2 3

Well you can't make 0x6 so far as I can see, so let's try for 6 ....... how about 7 - (2x3 - 5) = 7 + 5 - 2x3 ........ just saw that by looking as I saw that 2x3 = 6, the difference between 5 and 6 is one, and I needed to get the 7 down by one to get to 6 if you see what I mean.

Is this a bit like that game on TV - Countdown?

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 10:42 am

Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire
Yes I think they must be asking for operators, because it obviously isn't just putting the numbers into sequence.

7+5+2+3 = 17.

17 isn't divisible by 3, so no combination of these numbers (regardless of order) can possibly make a number divisible by 6 since all numbers with 6 as a factor will have 3 as a factor too.

Last edited by Okanagan on Thu Aug 30, 2012 11:09 am, edited 1 time in total.

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 10:52 am

Joined: Tue Oct 27, 2009 8:19 pm
Posts: 6821
18 is my guess.

7+5 = 12 / 2 = 6 x 3 = 18

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 11:20 am

Joined: Tue May 29, 2012 8:16 pm
Posts: 57
Oh I see - I thought it was asking for each card to be used once. There were 2 other questions using the same cards - 1) make the smallest possible even number and 2) make a number as close as possible to 4000. So I assumed it was using all 4 but couldn't see how??

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 11:24 am

Joined: Tue May 29, 2012 8:16 pm
Posts: 57
Okanagan wrote:
Yes I think they must be asking for operators, because it obviously isn't just putting the numbers into sequence.

7+5+2+3 = 17.

17 isn't divisible by 3, so no combination of these numbers (regardless of order) can possibly make a number divisible by 6 since all numbers with 6 as a factor will have 3 as a factor too.

Yes, this is where I got stumped - because the sum of numbers was 17 so impossible. Just a badly worded question then

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 11:26 am

Joined: Tue Oct 27, 2009 8:19 pm
Posts: 6821
My answer uses all 4 once.

I make the lowest even number 2

7-5 = 2

3 - 2 (from above) =1

1 (from above ) x 2 = 2

Too much time spent watching countdown I am afraid.

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 11:52 am

Joined: Thu May 10, 2012 8:30 am
Posts: 247
mystery wrote:
7 5 2 3

Well you can't make 0x6 so far as I can see

(5 x 2) - (7+ 3) = 0.

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 12:48 pm

Joined: Tue Oct 27, 2009 8:19 pm
Posts: 6821
Now a debate as to whether 0 is an even number or divisible by 6

Is there are lower even number than 2 or

a lower multiple of 6 than 18?

Really curious now as just love these questions.

Working on the 4000 now whilst sewing on name tapes!

Top

 Post subject: Re: Help please :)Posted: Thu Aug 30, 2012 1:05 pm

Joined: Thu Jun 14, 2012 9:28 am
Posts: 121
smallest possible even number 3 - (7-5)/2

smallest multiple of 6 - 7 - (5-3)/2

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 2 [ 19 posts ] Go to page 1, 2  Next

 All times are UTC

#### Who is online

Users browsing this forum: No registered users and 2 guests

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ FORUM RULES    Forum Rules and FAQs 11 PLUS SUBJECTS    VERBAL REASONING    MATHS    ENGLISH    NON-VERBAL REASONING    CEM 11 Plus GENERAL    GENERAL 11 PLUS TOPICS    11 PLUS APPEALS    11 PLUS TUTORS    INDEPENDENT SCHOOLS    11 PLUS CDs/SOFTWARE    11 PLUS TIPS    PRIMARY    SEN and the 11 PLUS    EVERYTHING ELSE .... 11 PLUS REGIONS    Berkshire    Bexley and Bromley    Birmingham, Walsall, Wolverhampton and Wrekin    Buckinghamshire    Devon    Dorset    Essex    Essex - Redbridge    Gloucestershire    Hertfordshire (South West)    Hertfordshire (Other and North London)    Kent    Lancashire & Cumbria    Lincolnshire    Medway    Northern Ireland    Surrey (Sutton, Kingston and Wandsworth)    Trafford    Warwickshire    Wiltshire    Wirral    Yorkshire BEYOND 11 PLUS    Beyond 11 Plus - General    GCSEs    6th Form    University