Go to navigation
It is currently Fri Dec 09, 2016 11:14 pm

All times are UTC




Post new topic Reply to topic  [ 17 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: tricky maths
PostPosted: Tue Sep 13, 2011 7:48 pm 
Offline

Joined: Wed May 25, 2011 10:36 pm
Posts: 35
Hi
Can anyone help with this question.

36 posts were spaced evenly along a road 7km long. What was the distance in metres between each pair of posts?

Many thanks.


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 7:58 pm 
7km is 7000 metres.
36 posts therefore 35 gaps, divide 7000 by 35 to get the distance


Top
  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 7:58 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
A diagram would help - think how many gaps there will be between 36 posts.

Hint - try a smaller number e.g. 5 posts

POST ......... POST ......... POST ......... POST ......... POST

get the idea? :D


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 8:55 pm 
Offline

Joined: Mon Aug 31, 2009 6:19 pm
Posts: 517
Location: bucks
Aaaah guest55 I wish you had been my maths teacher :wink:


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 9:00 pm 
Offline

Joined: Mon Aug 31, 2009 6:19 pm
Posts: 517
Location: bucks
Although the above method only works if you assume the posts are infinately thin otherwise you would have to express the answer in terms of post thickness=d(m) ie (7000-36d)/35


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 9:12 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
It is a poorly worded question because you have to assume that a post is at the beginning and end of the distance as well as dimension-less (or, as you say Tree, have no thickness).

Once you 'see' a question like this you use the correct number to divide by .... that's what learning Maths is about :D :D


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 10:02 pm 
I am a bit lost here, was my answer incorrect?


Top
  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 10:04 pm 
Offline

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8228
No, but you forgot to use the phrase "a diagram would help" :D


Top
 Profile  
 
 Post subject: Re: tricky maths
PostPosted: Tue Sep 13, 2011 10:08 pm 
Thanks mystery, sometimes forget parents need tutoring first :lol: :lol: :lol:


Top
  
 
 Post subject: Re: tricky maths
PostPosted: Wed Sep 14, 2011 6:13 am 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
no_ball - your post told the OP what to do but would not help in tackling another such question. Understanding and 'seeing' the question is more important ...


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 17 posts ]  Go to page 1, 2  Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


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