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 Post subject: Re: Ratios please help!
PostPosted: Tue Aug 07, 2018 10:29 am 
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Joined: Tue Aug 07, 2018 10:17 am
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Hi My daughter had this question on a practise paper:

Peter, Alex and Michelle share sweets in a bag in the ratio 4:3:2 Michelle receives 8 How many sweets are there in the bag at the start?

I was able to do it by looking at Michelle at the beginning and seeing what I needed to do to 2 to make it 8 i.e. times by 4 so times all the rest of the number by 4 then adding up the totals which came to the correct number 36. This is a long process though and in the back of the book they add 4+3+2 together then times it by 4. Why do you times it by 4?

Thank-you!


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 Post subject: Re: Ratios please help!
PostPosted: Tue Aug 07, 2018 10:59 am 
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there must be a multiple of 4+3+2=9 in the bag,

you know that Michelle gets 8 which is 4 times her share of the 9

so presume you then multiply 9*4 and get 36


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 Post subject: Re: Ratios please help!
PostPosted: Tue Aug 07, 2018 12:01 pm 
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Joined: Fri Mar 10, 2017 4:06 pm
Posts: 445
angelfire777 wrote:
Hi My daughter had this question on a practise paper:

Peter, Alex and Michelle share sweets in a bag in the ratio 4:3:2 Michelle receives 8 How many sweets are there in the bag at the start?

I was able to do it by looking at Michelle at the beginning and seeing what I needed to do to 2 to make it 8 i.e. times by 4 so times all the rest of the number by 4 then adding up the totals which came to the correct number 36. This is a long process though and in the back of the book they add 4+3+2 together then times it by 4. Why do you times it by 4?

Thank-you!


I think that you've already answered your own question haven't you? :)

You already worked out that you need to multiply each ratio by 4 and then total them up. It seems that all the book answer has done is to simplify the sum slightly by taking out the common factor of 4.

i.e. 4 * 4 + 4 * 3 + 4 * 2 = 4 (4 + 3 + 2)


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