6 oz of Pranav's Premium Coffee Blend was made by combining 2 oz of Arabica coffee beans which cost $12/oz with 4 oz of robusta coffee beans which cost $9/oz. Find the cost per oz of the mixture. SHow me how to do this so I will know how to do the other problems.

- anonymous

- katieb

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- anonymous

I will gladly appreciate if you help. Thank you very much.

- anonymous

$12 oz * 2= arabica
$9 oz *4 = robusta
arabica + robusta = pranav
just plug in the w
($12 oz * 2)+($9 oz *4 )= pranav

- anonymous

hmmm my teacher uses the box and then he plugs it in like that. XD Do you know how to use the rectangular box version?

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- anonymous

|dw:1363159124065:dw|

- anonymous

He plugs in the numbers in there and then he puts it into that equation you wrote.

- anonymous

|dw:1363159165717:dw|

- anonymous

C stands for cost /concentration and A is for amount

- anonymous

|dw:1363159234819:dw|
x can equal c*a
which is cost

- anonymous

I just want to know how you can plug in the box and transferring it into that equation. XD
I forgot to add more detail to the drawing XD

- anonymous

|dw:1363159271478:dw|

- anonymous

How do you know which box to plug in the numbers? Like which number goes to which box square?

- anonymous

maybe i am just guessing but you dont need the box
the box is just a visual aid.

- anonymous

|dw:1363159386553:dw|

- anonymous

wel lI am more of a visual learner. :P XD

- anonymous

|dw:1363159532318:dw|

- anonymous

I got 60 as well. XD But its asking the cost per oz of mixture. So is it just 60?

- anonymous

Or 10

- anonymous

60/6=10 :)

- anonymous

So then I am correct. XD

- anonymous

yes :)

- anonymous

Why did he have to make it complicated like that . may I ask you one more question for another math problem

- anonymous

A chemist wants to mix 12 grams of 10 percent salt solution with some 75 percent salt solution to get a 20 percent salt solution. How many grams of the 75 percent salt solution are needed? I got an answer of 2.18

- anonymous

or 2.48

- anonymous

idk tho not 100 sure

- anonymous

ok then thanks though I appreciate your help ^.^ I will figure out the rest on my own by examining the review I went over with m teacher thank you.

- anonymous

btw i am wrong on that last one

- anonymous

2.608695652 now i get

- anonymous

1/120+2/(4*a) = (20/100) is formula

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