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 Post subject: Ratio problemPosted: Mon Nov 26, 2018 2:12 pm

Joined: Mon Nov 26, 2018 2:06 pm
Posts: 6
If one cake and two biscuits provide 450 calories and two
cakes and three biscuits provide 800 calories, how many
calories are provided by one biscuit?

How to solve this problem, please?

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 2:43 pm

Joined: Mon Jan 24, 2011 5:33 pm
Posts: 1763
How old is the child tackling the problem? I know how I'd do it but it might not be appropriate for someone in say, year 5.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 2:45 pm

Joined: Mon Nov 26, 2018 2:06 pm
Posts: 6
9 years old.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 2:46 pm

Joined: Mon Jan 24, 2011 5:33 pm
Posts: 1763
In which case I'll leave it to the maths teachers on here because I may end up confusing the situation. I suspect my method won't have been covered in school yet.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 2:50 pm

Joined: Wed Sep 02, 2015 10:56 am
Posts: 283
Hi Erijhkan - Is this for an 11+?

Anyway, can you work out how many calories there are in 1 cake and 1 biscuit? Hint: look at the difference between the facts you have been given.

From there you can compare 1 cake and 1 biscuit with 1 cake and 2 biscuits. The difference will be the extra biscuit.

Edit: Crossed post with anotherdad. I suspect this is beyond KS2. Guest will know for sure.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 2:58 pm

Joined: Mon Nov 26, 2018 2:06 pm
Posts: 6

Yes, this is for 11+, from one of the grammar school paper.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 3:02 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
Erijkhan wrote:
If one cake and two biscuits provide 450 calories and two cakes and three biscuits provide 800 calories, how many calories are provided by one biscuit?

This is not a Year 5 question.

one cake and two biscuits provide 450 calories
two cakes and three biscuits provide 800 calories

The difference between these two sentences tells us that one cake and one biscuit provide 350 calories.

Now compare to the first sentence - the 'extra' biscuit must be 100 calories.

{It is not appropriate to try and use algebra for these}

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 3:05 pm

Joined: Tue Oct 04, 2011 9:44 am
Posts: 1841
Erijkhan wrote:
If one cake and two biscuits provide 450 calories and two
cakes and three biscuits provide 800 calories, how many
calories are provided by one biscuit?

How to solve this problem, please?

you know:
1c + 2b = 450
2c + 3b = 800

therefore, from the first fact
2c + 4b = 900 (by doubling)

therefore the diff is 1b so 1b = 100

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 3:07 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
Reading mum - algebra is not appropriate or needed here.

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 Post subject: Re: Ratio problemPosted: Mon Nov 26, 2018 3:08 pm

Joined: Tue Oct 04, 2011 9:44 am
Posts: 1841
its the only way I know, and how my DD would have done it (probably related to the first point)

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