It is currently Tue Dec 06, 2016 10:20 am

 All times are UTC

 Page 1 of 1 [ 5 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: maths questionPosted: Wed Mar 07, 2012 7:57 pm

Joined: Wed Jan 11, 2012 8:36 pm
Posts: 18
Hi can someone help with this maths question.
2 dogs take 18 days to eat some dog food. how long will it take 3 dogs to eat the same amount of food.

thank you

Top

 Post subject: Re: maths questionPosted: Wed Mar 07, 2012 8:00 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11940
Quote:
2 dogs take 18 days to eat some dog food. how long will it take 3 dogs to eat the same amount of food.

How long would the food last for one dog?

It would last 2 x 18 ie 36 days

So if there were 3 dogs ..36 divided by 3 = 12

Top

 Post subject: Re: maths questionPosted: Thu Mar 08, 2012 7:25 am

Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire
or put another way ⅔ of 18

the number of dogs is 1½ times what it was before -
so 18 / 1½ (or 3/2)
invert the fraction and change divide to multiply to get
18 x ⅔

Top

 Post subject: Re: maths questionPosted: Thu Mar 08, 2012 6:37 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11940
That's not a very clear method imho - inverse proportion needs explanation.

Top

 Post subject: Re: maths questionPosted: Wed Mar 14, 2012 6:41 pm

Joined: Mon Nov 08, 2010 9:15 am
Posts: 42
Location: Birmingham
If it takes 2 dogs 18 days, then on his own, it would take one dog 36 days.

Therefore, 3 dogs would divide the food equally 36 / 3 = 12.

It would take 12 days, as the other two have said.

_________________
"A teacher affects eternity; he can never tell where his influence stops."

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 5 posts ]

 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