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 Post subject: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:42 am 
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Joined: Wed Nov 02, 2011 9:45 pm
Posts: 118
Hi all,

Please help me explain this to my ten year old.

When two fifths of class are absent, there are 18 absent. What is total number of children in the class?

Thanks all


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 Post subject: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:43 am 
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Joined: Wed Nov 02, 2011 9:45 pm
Posts: 118
Hi all,

Please help me explain this to my ten year old.

When two fifths of class are absent, there are 18 present. What is total number of children in the class?

Thanks all


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:52 am 
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Joined: Wed Aug 01, 2007 11:19 am
Posts: 888
If 2/5 are absent, what fraction of the class is present?

1 - 2/5 = 3/5

So now you know three fifths of the total number = 18.
What is one fifth?

18 / 3 = 6

The whole class is five fifths, therefore total class size = 5 x 6 = 30


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:54 am 
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Joined: Wed Aug 01, 2007 11:19 am
Posts: 888
Oh, I looked at both, assumed you had corrected absent to present, and then replied to the wrong one!

You can edit your post using the button at bottom right.


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:56 am 
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Joined: Wed Sep 05, 2012 6:08 pm
Posts: 373
From Kingfishers age 11 daughter:

2/5 = 40% of class
Therefore, 18= 60% of class
18 divided by 6= 3
So 10% = 3
Then you just multiply 3 by 10 to get 30.

Hope I helped :D


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 11:58 am 
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Joined: Wed Sep 05, 2012 6:08 pm
Posts: 373
From Kingfishers daughter:

So we know 2/5 = 18.
Divide 18 by 2 to get 1/5, which is 9.
Then you just multiply 9 by 5, and so the answer is 45.

:D


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 12:11 pm 
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Joined: Wed Nov 23, 2011 12:52 pm
Posts: 603
Location: Shamballa
No the answer is 30.

3/5 are present.

3/5=18

_________________
"To err is human;to forgive ,divine"


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 12:14 pm 
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Joined: Wed Sep 05, 2012 6:08 pm
Posts: 373
Roz12 wrote:
Hi all,

Please help me explain this to my ten year old.

When two fifths of class are absent, there are 18 absent. What is total number of children in the class?

Thanks all


When two fifths of class are absent, there are 18 absent.

I think perhaps you misread the second absent as present.

Also I think Roz12 was slightly confusing by posting almost the same question twice, one reading When two fifths of class are absent, there are 18 present.

The mistake is understandable :)


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 Post subject: Re: Maths Q help!!
PostPosted: Sun Oct 27, 2013 1:29 pm 
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Joined: Wed Nov 02, 2011 9:45 pm
Posts: 118
Hi all

yes I did post the message incorrectly but I now know about the edit button!!

Thanks


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