It is currently Sat Jan 20, 2018 1:00 pm

 All times are UTC

 Page 1 of 1 [ 4 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Not sure how to answer - Habs Boys Maths 2014Posted: Thu Nov 19, 2015 7:42 am

Joined: Tue Aug 21, 2012 8:48 pm
Posts: 257
Hello, DD completed this paper yesterday and DH and she disagree about the answer to the following:

Question 2
In the winter, I try and climb up an icy slope starting at the bottom. Each time I
make a move I find that I go up four metres but then slide back down two metres.
How many moves do I need to get to the top which is 8 metres up the slope from
the bottom?
___________

DH says that because you would have reached the top at move 3, even though you would then slip back 2 metres. DD says 4 moves to actually reach and stay at the top. Who is right? Suggestions,please!
Thanks.
Stokers

Top

 Post subject: Re: Not sure how to answer - Habs Boys Maths 2014Posted: Thu Nov 19, 2015 9:47 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14002
Quote:
In the winter, I try and climb up an icy slope starting at the bottom. Each time I
make a move I find that I go up four metres but then slide back down two metres.
How many moves do I need to get to the top which is 8 metres up the slope from
the bottom?

I think the answer is three because once you are at the top you can move on.

First move: up 4 to 4 metres from top but slip back 2 - so now 6 metres from the top

Second move: up 4 to 2 metres from the top but then slip back 2 - so now 4 metres from the top

Third move: up 4 metres so at the top.

There are other problems like this - frog in a well etc.

Top

 Post subject: Re: Not sure how to answer - Habs Boys Maths 2014Posted: Thu Nov 19, 2015 9:59 am

Joined: Thu Apr 04, 2013 10:39 am
Posts: 845
DD thought it was 3 moves - her reasoning being that as soon as you reach the top the ground is not sloped and you won't slide back down. I thought it was 4 moves, as you wouldn't move 4m up and 2m down in discrete movements but continually a bit up and a bit down. I accepted DD's reasoning but clearly there's some ambiguity in the question. Should one apply common sense or follow the exact wording?

nyr

Top

 Post subject: Re: Not sure how to answer - Habs Boys Maths 2014Posted: Thu Nov 19, 2015 8:28 pm

Joined: Tue Aug 21, 2012 8:48 pm
Posts: 257
Thanks, Guest55 and nyr - I'm in the 3 moves camp, I think, as you will reach the top in 3 moves, even if you do then slide down again!

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 4 posts ]

 All times are UTC

Who is online

Users browsing this forum: No registered users and 1 guest

 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