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 Post subject: tricky mathsPosted: Tue Sep 13, 2011 7:48 pm

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.

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

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 7:58 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14000
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?

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 8:55 pm

Joined: Mon Aug 31, 2009 6:19 pm
Posts: 532
Location: bucks
Aaaah guest55 I wish you had been my maths teacher

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 9:00 pm

Joined: Mon Aug 31, 2009 6:19 pm
Posts: 532
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

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 9:12 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14000
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

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

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 10:04 pm

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8545
No, but you forgot to use the phrase "a diagram would help"

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 Post subject: Re: tricky mathsPosted: Tue Sep 13, 2011 10:08 pm
Thanks mystery, sometimes forget parents need tutoring first

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 Post subject: Re: tricky mathsPosted: Wed Sep 14, 2011 6:13 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14000
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 ...

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