It is currently Sat Jul 02, 2022 2:25 pm

 All times are UTC [ DST ]

 Page 1 of 1 [ 7 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: 2018 maths 11+ paperPosted: Thu Oct 15, 2020 4:41 pm

Joined: Sat Oct 10, 2009 4:04 pm
Posts: 92
Can someone just clarify something for me on q14d

What is the percentage increase in the cost of buying dollars from June 23rd to June 26th?

June 23rd = \$1.40
June 26th = \$1.25

The answer is 12% which im assuming is 0.15/1.25

BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Thu Oct 15, 2020 10:25 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
Can someone just clarify something for me on q14d

What is the percentage increase in the cost of buying dollars from June 23rd to June 26th?

June 23rd = \$1.40
June 26th = \$1.25

The answer is 12% which im assuming is 0.15/1.25

BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?

Is that the whole question? You are correct in the way % increase/decrease is defined - however % increase and decrease is not taught at Primary so the question is not appropriate anyway.

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Fri Oct 16, 2020 7:07 am

Joined: Wed Jan 18, 2012 12:41 pm
Posts: 11098
Location: Essex
I have a feeling that this is one of those where Guest55 may pop up to comment on its suitability as an 11+ question. Or at all...

Is that the whole question? Not the second part of one which e.g. asks how much it costs to buy a dollar on each of the dates, first?

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Fri Oct 16, 2020 8:52 am

Joined: Fri Jul 04, 2014 11:45 am
Posts: 235
Please note (again) this section is for 11 plus maths not for the discussion of primary or NC maths.

Moderators

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Fri Oct 16, 2020 9:06 am

Joined: Wed Jan 18, 2012 12:41 pm
Posts: 11098
Location: Essex
Not wishing to be disrespectful, but one of the points that both G55 and I have made is surely a valid one, at least, that there appears to be part of the question missing?

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Fri Oct 16, 2020 10:29 am

Joined: Wed Feb 27, 2008 9:59 am
Posts: 2631
It is not disrespectful TM you have correctly identified the on topic point from the off topic point. We are always happy to give further guidance if required.

Top

 Post subject: Re: 2018 maths 11+ paperPosted: Tue Oct 27, 2020 10:37 am

Joined: Mon Sep 14, 2020 1:35 pm
Posts: 52
BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?

Imagine you wanted to buy \$140. On the 23rd, you'd need 100 (probably pounds but could be any currency for purposes of this question). On the 26th, since \$ has strengthened, you'd need 112 (140/1.25) which is your 12% increase (100 being your base/original amount). The question is asking for the % increase in cost of buying dollars, not the % change in the exchange rate.

Alternatively, you could ignore this and simply tell your DC that it's an inapppropriate question for 11+

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 7 posts ]

 All times are UTC [ DST ]

#### Who is online

Users browsing this forum: No registered users and 5 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    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