Question 970404
How many milliliters of a 25% hydrogen peroxide solution and how many milliliters of a 9% hydrogen peroxide solution should be mixed to get 176 mL of a 18% hydrogen peroxide solution?
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let x=amt of 25% solution to mix
176-x=amt of 9% solution to mix
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25%x+9%(176-x)=18%*176
.25x+15.84-.09x=31.68
.16x=15.84
x=99
176-x=77
amt of 25% solution to mix=99 mm
amt of 9% solution to mix=77 mm