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

All times are UTC




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: % question help
PostPosted: Mon Jan 04, 2016 12:59 pm 
Offline

Joined: Tue Dec 29, 2015 6:25 pm
Posts: 4
Help please:

Jane has a box of counters; 50% are green, 25% are blue, and there are 11 white counters.
How many counters are there altogether?


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Mon Jan 04, 2016 1:15 pm 
Offline

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8203
Location: Buckinghamshire
Another badly worded question! If it said "Jane has a box of counters of 3 colours" it would be far clearer.

Anyway, assuming that there are only 3 colours, the 11 white counters represent the remaining 25%/quarter, and therefore 11 x 4 = 44 counters in total.


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Mon Jan 04, 2016 1:16 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11940
Quote:
Jane has a box of counters; 50% are green, 25% are blue, and there are 11 white counters.
How many counters are there altogether?



A bit vague as it does not say the box has three colours of counters in it! It should say 'the other 11 are white'.

What percentage must the whole box be?

What percentage is white?

Can you go from there? Come back if not.

[crossed post with S-A - great minds think alike re the question!]


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Mon Jan 04, 2016 1:17 pm 
Offline

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1770
Location: caversham
Knowing there are 100% in total then white is 100-50-25 = 25%.

So if 25% (or one quarter) are white and total eleven counters then multiply by four to get 100% so 44 counters in total.

Again drawing a diagram and having more steps help if you are trying to explain to a student. :)

x-post with a faster typist ! oh and another one. :lol:


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Mon Jan 04, 2016 1:24 pm 
Offline

Joined: Tue Dec 29, 2015 6:25 pm
Posts: 4
Thanks, makes sense now.


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Mon Jan 04, 2016 5:59 pm 
Offline

Joined: Fri Mar 17, 2006 5:12 pm
Posts: 1300
Location: Birmingham
I wonder what would actually happen if a child in the exam stated that "the result cannot be determined as the question does not state if there are any other coloured counters apart from green, blue and white."


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Thu Jan 07, 2016 9:36 pm 
Offline

Joined: Sat Aug 15, 2015 11:00 am
Posts: 51
An extremely fast way of solving this is.....
First we analyse the question and quickly note down that there are three colours
and then we see that 50percent plus 25 percent equals to 75percent and as stated 11 white so 25percent is white therefore 25x25+50 equals 100percent


Top
 Profile  
 
 Post subject: Re: % question help
PostPosted: Thu Jan 07, 2016 9:43 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11940
The problem is that it doesn't EXPLICITLY say there are only three colours - so the whole question is ambiguous.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 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 forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
CALL 020 8204 5060
   
Privacy Policy | Refund Policy | Disclaimer | Copyright © 2004 – 2016