# SOLUTION: A printer has ink that is 8% cobalt blue color and ink that is 18% cobalt blue color. How many ounces of each ink are needed to make 3 gallon (384 ounces) of ink that is 13% cobalt

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 Question 404583: A printer has ink that is 8% cobalt blue color and ink that is 18% cobalt blue color. How many ounces of each ink are needed to make 3 gallon (384 ounces) of ink that is 13% cobalt blue color? Answer by stanbon(57347)   (Show Source): You can put this solution on YOUR website!A printer has ink that is 8% cobalt blue color and ink that is 18% cobalt blue color. How many ounces of each ink are needed to make 3 gallon (384 ounces) of ink that is 13% cobalt blue color? ---- Equations: a + b = 384 ounces 0.08a + 0.18b = 0.13*384 ---- Multiply 1st by 8 and 2nd by 100 to get: ---- 8a + 8b = 8*384 8a + 18b = 13*384 ===== Subtract and solve for "b": 10b = 5(384) b = (1/2)384 b = 192 ounces (amt. of 18% solution needed) a = 192 Ounces (amt of 8% solution needed) =================== Cheers, Stan H.