SOLUTION: A printer has ink that is 3% cobalt blue color and ink that is 7% cobalt blue color. How many ounces of each ink are needed to make 2 gallons (256 ounces) of ink that is 5% cobalt

Question 1067513: A printer has ink that is 3% cobalt blue color and ink that is 7% cobalt blue color. How many ounces of each ink are needed to make 2 gallons (256 ounces) of ink that is 5% cobalt blue color?
3% cobalt blue color_________oz��

7% cobalt blue color__________oz��

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ounces of 3% cobalt blue color needed
Let = ounces of 7% cobalt blue color needed
---------------------------------------------------
(1)
(2)
-----------------------------------
(2)
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
--------------------------

and
(1)
(1)
(1)
--------------------
128 ounces of 3% cobalt blue color are needed
128 ounces of 7% cobalt blue color are needed
--------------------
check:
(2)
(2)
(2)
(2)
(2)
OK
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