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  #1  
Old 11-30-2010, 01:24 AM
Treighsie Treighsie is offline
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Default Does anyone know the answer to this????

This is my daughter's homework.

1. Three numbers are in the ratio 3:5:7. If the largest number is multiplied by 3, the result is 26 more than the sum of the first and second numbers. Use an algebraic solution to find the answer.
The first number is
The second number is
The third number is


2. Ramos buys some pens and pencils. He buys seven more pens than pencils. Pens cost .45 cents and pencils cost .40cents. If he has $10 to spend, what is the greatest number of each he can buy?
Ramos can buy at most _____ pens and _____ pencils.


I have to say, she had 25 problems. So far she has 19 right and only 4 wrong. (Oh, and one of the 19 right, I did )
These have us stumped.
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  #2  
Old 11-30-2010, 01:31 AM
Lucid-sunshine Lucid-sunshine is offline
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hold please dh ( math man is workiong on it)
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  #3  
Old 11-30-2010, 01:31 AM
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Paty's Loveys Paty's Loveys is offline
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I googled the 1st one
http://answers.yahoo.com/question/in...2134215AAg64WQ
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  #4  
Old 11-30-2010, 01:31 AM
kdina kdina is offline
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I'm sending em to my Math teacher buddy
I'll be back.
  #5  
Old 11-30-2010, 01:32 AM
chickipoo chickipoo is offline
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Quote:
Originally Posted by Lucid-sunshine View Post
hold please dh ( math man is workiong on it)
mine is trying too! he's stuck though!
  #6  
Old 11-30-2010, 01:43 AM
kdina kdina is offline
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2 would be pens = x, pencils = y

10 = .45x + .40y
x = y + 7 (since he buys 7 more pens than pencils)

On the first one, you can represent the three numbers as 3x, 5x, and 7x. Then you'd have

3(7x)=26 + 3x + 5x.
  #7  
Old 11-30-2010, 01:43 AM
haelyn79 haelyn79 is offline
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I don't know number 1. Here's how I solved number 2:

Pens = P, Pencils = PE

.45P + .4PE = $10.00
P = PE + 7

.45(PE + 7) + .4PE = $10.00
.45PE + 3.15 + 4PE = $10.00

.85PE + 3.15 = $10.00
-3.15 -3.15
------- -------
.85PE = $6.85

So, PE = 8

PE + 7 = 15

So, the answer is: 8 Pencils and 15 Pens
  #8  
Old 11-30-2010, 01:44 AM
chickipoo chickipoo is offline
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he gave up!
  #9  
Old 11-30-2010, 01:45 AM
haelyn79 haelyn79 is offline
Where's that title fairy?
 
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Those -$3.15 were supposed to be over further so they were under the $3.15 and the $10.00.
  #10  
Old 11-30-2010, 01:47 AM
Lucid-sunshine Lucid-sunshine is offline
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8 pens = .45x8 $3.60
15 pencils = .40 x 15 $6.00

total $9.60
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  #11  
Old 11-30-2010, 02:35 AM
batmansmom batmansmom is offline
like a beverly hillbilly or something.
 
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i hate math!
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  #12  
Old 11-30-2010, 11:07 AM
Treighsie Treighsie is offline
I am SO EXCITED!!
 
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Thank you guys!! She was really happy to get on here and see answers!

And by the way, I was doing the 3:5:7 one and had the right idea, I just couldn't finish it.
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  #13  
Old 11-30-2010, 11:58 AM
Treighsie Treighsie is offline
I am SO EXCITED!!
 
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Thanks, they were both right!
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