SOLUTION: If you mix 140 mL of a 60% acid solution with 200 mL of a 30% solution you get a 350 mL of a _____% solution.

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Question 53527: If you mix 140 mL of a 60% acid solution with 200 mL of a 30% solution you get a 350 mL of a _____% solution.
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
Set it up as a linear equation:
Ax+By=C
A=the rate, percent or cost of item A
x=the amount or number of item A
B=the rate, percent or cost of item B
y=the amount or number of item B
C=the total amount or C=A+B
.
(.60)(140)+(.30)(200)=(350)(x%) [Simplify]
84+60=350x
144=350x
144/350=x%
.4114=x%
.4114 X 100% = x% [Change .4114 to a percentage by multiplying by 100%]
41.14=x%
.
Check the answer by plugging 41.14% or .4114 back into the original equation.