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 Post subject: 2018 maths 11+ paper
PostPosted: Thu Oct 15, 2020 3:41 pm 
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Joined: Sat Oct 10, 2009 3:04 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 ?


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Thu Oct 15, 2020 9:25 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 16239
chelmsford dad wrote:
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.


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Fri Oct 16, 2020 6:07 am 
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Joined: Wed Jan 18, 2012 11:41 am
Posts: 10326
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?

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


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Fri Oct 16, 2020 7:52 am 
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Joined: Fri Jul 04, 2014 10:45 am
Posts: 225
Please note (again) this section is for 11 plus maths not for the discussion of primary or NC maths.

Please stay on topic.

Moderators


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Fri Oct 16, 2020 8:06 am 
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Joined: Wed Jan 18, 2012 11:41 am
Posts: 10326
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?

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


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Fri Oct 16, 2020 9:29 am 
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Joined: Wed Feb 27, 2008 8:59 am
Posts: 2556
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.


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 Post subject: Re: 2018 maths 11+ paper
PostPosted: Tue Oct 27, 2020 9:37 am 
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Joined: Mon Sep 14, 2020 12:35 pm
Posts: 33
chelmsford dad wrote:
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+


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