SOLUTION: The Question is: a chemist plans to combine a 12% acid solution with a 30% acid solution to make 72 litres of a 20% solution. Use simultaneous equations to determine how many litre

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Question 875143: The Question is: a chemist plans to combine a 12% acid solution with a 30% acid solution to make 72 litres of a 20% solution. Use simultaneous equations to determine how many litres of each solution that should be used?

Found 2 solutions by josgarithmetic, lwsshak3:
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
You are generally looking for what is explained in here:
Mixing two concentrations for known amount of mixture
That also shows the solution.

Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
The Question is: a chemist plans to combine a 12% acid solution with a 30% acid solution to make 72 litres of a 20% solution. Use simultaneous equations to determine how many litres of each solution that should be used?
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let x=amt of 12% solution to be used
72-x=amt of 30% solution to be used
12%x+30%(72-x)=20%*72
.12x+21.6-.30x=14.4
.18x=7.2
x=40
72-x=32
amt of 12% solution to be used=40 litres
amt of 30% solution to be used=32 litres