SOLUTION: The Denver Chemical Company wants to increase its 10% peroxide solution to a 28% solution by adding 100% peroxide. If Denver has 500 gallons its original 10% peroxide, how much pur

Question 349990: The Denver Chemical Company wants to increase its 10% peroxide solution to a 28% solution by adding 100% peroxide. If Denver has 500 gallons its original 10% peroxide, how much pure peroxide must it add to obtain the new mixture?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
10% peroxide solution 500 gallons
100% let it be x gallons
to a 28% solution total = 500 +x gallons
..
0.1*500 +x = 0.28(500+x)
50+x =140+0.28x
x-0.28x=140-50
0.72x=90
/0.72
x=90/0.72
125 gallons
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