# SOLUTION: A pharmacist wants to make 18 ml of a 6% hydrogen peroxide solution. How many mls of 5% hydrogen peroxide must he mix with 7% hydrogen peroxide to make the desired solution?

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 Click here to see ALL problems on Linear Equations And Systems Word Problems Question 596472: A pharmacist wants to make 18 ml of a 6% hydrogen peroxide solution. How many mls of 5% hydrogen peroxide must he mix with 7% hydrogen peroxide to make the desired solution?Answer by josmiceli(9686)   (Show Source): You can put this solution on YOUR website!Let = ml of 5% solution needed Let = ml of 7% solution needed = ml of hydrogen peroxide in 5% solution = ml of hydrogen peroxide in 7% solution ---------------------------------------- given: (1) (2) -------------------------- (2) (2) (2) Multiply both sides of (1) by and subtract (1) from (2) (2) (1) and, since (1) (1) (1) 9 ml of 5% solution is needed 9 ml of 7% solution is needed check: (2) (2) (2) (2) (2) (2) OK