Re: bag of marbles question 5th grade HELP!

"Paul Sperry" <plsperry@[EMAIL PROTECTED]
> wrote in message 
news:080420080115029670%plsperry@[EMAIL PROTECTED]
> In article <42244$47fad5af$45283fd7$2586@[EMAIL PROTECTED]
>, Marvel
> <goh@[EMAIL PROTECTED]
> wrote:
>
>> What would the formula be?
>>
>> In a bag of  red and black marbles there are 18 fewer red marbles than 
>> black
>>
>> If 45% of the marbles are red how many marbles are in the bag.
>>
>>
>
> The problem is about red and black marbles and asks a question about
> "how many" so it seems a good start would be to let R be the number of
> red marbles and B the number of black marbles.
>
> Now translate:
>
> "there are 18 fewer red marbles than black" i.e. R = B - 18.
>
> "45% of the marbles are red" A little trickier; 45% of _all_ the
> marbles are red i.e. R = 0.45(R + B).
>
> So,
>
> R = B - 18 and
> R = 0.45(R + B).
>
> Can you take it from there? If not, get back to us.
>
> -- 
> Paul Sperry
> Columbia, SC (USA)
>
I'm getting back because I don't get R = 0.45(R + B).

Now I see 45% and 55% who have a difference of 10 and 18 is the 10.

So eighteen is ten per cent of the entire thing, meaning one hundred
eighty 
is 100%


Marvel
Charlotte N.C. USA