SOLUTION: 75 mL of a 10% acid solution are mixed with 30 mL of a 2.5% acid solution. how much acid is in the mixture

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Question 898843: 75 mL of a 10% acid solution are mixed with 30 mL of a 2.5% acid solution. how much acid is in the mixture
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
75*.10+30*.025=105*x
7.5+.75 =8.25
105x=8.25
x=0.0786
x=7.86%